The Sea Is Not Full

My mom read the last thing I wrote here, along with the teaching on Tool’s Right in Two, and texted me a question I couldn’t answer quickly. If we can see the pattern, she asked, and still fail to learn from it, where is the hope? Then she answered herself, more bleakly than I would have:

Many societies have collapsed, and here we are doing the same things that brought them down. The pattern is ancient and persistent. Incentives favor short term power. Lived experience fades, and what is left, at best, are faded stories detached from the emotions that could prevent a repeat.

I wrote back that when real tragedy strikes, people reclaim their humanity. Look at natural disasters, I said: people band together and put their lives on the line for strangers. The sad part is that it takes those conditions to bring it out of us. And then I told her what I actually think. Underneath most of it is one mechanism, a psychologist’s term most people have never heard, and it is the true culprit.

The term is hedonic adaptation. This site has used it once before, in Everything That I Am, to explain why Carl Sagan worked so hard to make the universe feel strange again. Sagan understood that familiarity had dulled people’s capacity to feel how strange the universe is, and he spent a career trying to get past it. I believe what I told my mom. That is exactly why it has to come through this section’s door. The strongest evidence goes first, the losses get reported, and at the end comes a plain account of what has not been shown. Sagan never asked anyone to lower their standards in order to be amazed, and neither will this.

I.The Phenomenon

Start with what everyone already knows from the inside.

The raise is wonderful for a few weeks, and then it is your salary. The new car smells new for a month. The house you stretched to afford becomes the house you live in, and then the house with the kitchen you would like to redo. Nobody decides any of this, and almost nobody notices it happening. What you wanted becomes the floor you stand on, and you start wanting from there.

It runs the other way too, and this half gets less attention. People lose a job, a marriage, or the use of their legs, and most of them, most of the time, find their way back to something like an ordinary day. They are not the same as before, but they are less shattered than they were sure they would be. The same mechanism that takes the shine off the new car is what lets a widow get out of bed in the second year.

There is a public form of it, and it is the one my mom was worried about. Tool opened their 2006 album 10,000 Days with a song about it, Vicarious. The narrator watches catastrophe from a safe distance and wants it, because it is how he feels anything at all:

Eye on the TV, ’cause tragedy thrills meWhatever flavor it happens to be likeKilled by the husband, drowned by the oceanShot by his own son, she used the poison in his tea,Then kissed him goodbye, that’s my kind of storyIt’s no fun ’til someone dies

I need to watch things dieFrom a good safe distanceVicariously, I live while the whole world diesYou all feel the same, soWhy can’t we just admit it?

The last line turns on the listener, and it is the most uncomfortable thing on the record. Movement II has something like an answer. Yes, the body’s alarm really does dull with repetition. No, the evidence does not say that makes anyone cruel.

What happens to the new car happens to the news. Last year’s shock is this year’s baseline, so the screen has to find something worse to get the same reaction. My mom’s word for what fills those screens was addicting.

And there is the thing I told her about disasters. In the weeks after the 1906 San Francisco earthquake, with the city still burning, people set up kitchens in the streets and parks. One woman started cooking for strangers in Golden Gate Park with nothing but a few tin cans. Visitors from a Nevada mining town named her kitchen the Mizpah Café, and it fed a few hundred people at a time. Someone hung a sign over another kitchen: Eat, drink, and be merry for tomorrow we may have to go to Oakland. People made jokes in the ashes, and fed each other. Then, over the following months, the kitchens closed and the city went back to being a city.

That is everything reported so far. Nothing has been explained, and nothing argued.

II.What the Evidence Shows

The story almost everyone tells wrong. Most popular accounts of hedonic adaptation lean on one paper: Brickman, Coates and Janoff-Bulman’s 1978 study of lottery winners and accident victims. The usual retelling is that a year later, people who had won the lottery were no happier than people who had been paralyzed. That is not what the study found, and the real version is better.

The researchers interviewed 22 people who had won $50,000 or more in the Illinois lottery, 22 neighbours as controls, and 29 people paralyzed in accidents: 11 paraplegic and 18 quadriplegic. On a five-point scale of present happiness, the winners averaged 4.00, the neighbours 3.82, and the accident victims 2.96. The winners really were no happier than the people next door. They also took less pleasure in a list of ordinary things the researchers asked about. The windfall had raised the floor, and the small pleasures that used to stand above it now sat below. That half of the story holds.

But the accident victims were clearly less happy, by a margin Ed Diener and his colleagues later recalculated at about three-quarters of a standard deviation, which they called large. They were also above the midpoint of the scale, within about a year of the worst thing that had ever happened to them. Neither “nothing changes” nor “everything recovers” is true. The truth is stranger and more human than either: a person whose body has been broken can be less happy than before and still, on balance, more happy than not. The study was small, the groups were interviewed in different ways, and each person was measured once. It is a starting point that has been told as a conclusion for almost fifty years.

The model, revised by the people who built it. In 2006 Diener, Richard Lucas and Christie Napa Scollon published “Beyond the Hedonic Treadmill,” a revision of the theory from inside the field. They kept adaptation and changed almost everything around it:

• People’s resting points are not neutral; most people sit somewhat above neutral.
• Resting points differ from person to person, partly by temperament.
• A person has more than one: life satisfaction, pleasant feelings and unpleasant feelings can move separately.
• Resting points “can change under some conditions.” They called this the most important revision.
• People differ in how much, and how fast, they adapt.

The evidence for adaptation, they concluded, was “not nearly as strong as many psychologists have tended to assume.”

What people don’t adapt to. Lucas spent the next years finding out. Following more than 24,000 Germans across fifteen years, he and his colleagues found that unemployment lowers life satisfaction and that, on average, people don’t fully recover, even after they find work again. The same was true of divorce. Recovery from a spouse’s death took the better part of a decade and was not quite complete. People who became severely disabled showed large drops with very little adaptation over time. His summary of the whole body of work was four words: “adaptation is not inevitable.” The shock absorber is real, but some roads are too rough for it.

A sentence its author wished back. In 1996 David Lykken and Auke Tellegen studied several thousand middle-aged twins. They found that genes accounted for roughly half the variation in people’s well-being, while income, education, marriage and religion each accounted for about three percent or less. In the paper they wrote that trying to be happier “is as futile as trying to be taller.” The line went everywhere. That same summer, Lykken told Newsweek: “I regretted that as soon as it came out.” Five years later he called the inference mistaken in print. Heritability describes variation across a population; it doesn’t set the ceiling on any one person’s life. I find the regret moving: a scientist chasing his own sentence around the world, trying to take it back. The retraction travelled much less far than the line.

We are bad at predicting all of this. Timothy Wilson and Daniel Gilbert, who study what they call affective forecasting, find that people “overestimate the intensity and duration of their emotional reactions to future events.” We expect the promotion to make us happy for longer than it does, and the rejection to hurt for longer than it does. Part of the error, Gilbert’s group found, comes from what they call the psychological immune system: a quiet, constant sense-making that softens bad news, which we never see coming and so never count on. We are more resilient than we know. We are also less satisfiable than we know, for the same reason.

Money, measured honestly. In 2010 Daniel Kahneman and Angus Deaton analysed more than 450,000 survey responses. They found that day-to-day emotional well-being rose with income until about $75,000 a year, and then made “no further progress.” The number became a cultural fact. In 2021 Matthew Killingsworth, working from 1.7 million in-the-moment reports, found “no evidence for an experienced well-being plateau above $75,000.”

Then something happened that is rarer in science than it should be. In 2023 Killingsworth, Kahneman and Barbara Mellers wrote a paper together as former opponents and reanalysed the data side by side. The plateau turned out to be real, but only for the least happy fifteen to twenty percent of people. For most people, well-being keeps rising with income, more slowly the more they have. Kahneman was close to ninety, and one of the most celebrated psychologists alive. He agreed to work with the younger researcher who had contradicted him, so that both could find out what was true. That is the method this section is built on, practised at the top of the field.

Across whole countries the question is still open. Richard Easterlin found in 1974 that as nations grew richer over decades, their average happiness did not rise. Betsey Stevenson and Justin Wolfers challenged that in 2008, Easterlin and colleagues answered in 2010, and the dispute continues. This piece doesn’t settle it.

The neighbours. Erzo Luttmer, working with a panel of about 10,000 Americans, found that people whose neighbours earned more reported being less happy, holding their own income constant. The effect was roughly as large as that of their own income, in the opposite direction, and stronger for people who spent time with their neighbours. Your raise and your neighbour’s raise pull on the same rope, from opposite ends.

Wanting things. In 2014 Helga Dittmar and colleagues pooled 258 samples on materialism, meaning how much people value money and possessions, and its link to well-being. The average correlation was negative: r = −.15. It is small to moderate, mostly correlational, and it varied a great deal from study to study. It is a real association, not a verdict on anyone.

The disasters. I told my mom that tragedy brings out people’s humanity, and the research supports me. Charles Fritz, one of the founders of modern disaster research, lived through wartime England and worked on the US Strategic Bombing Survey before he turned to disasters. His 1961 paper opens with a question no one had thought to ask: “Why do large-scale disasters produce such mentally healthy conditions?” His answer, in a line Rebecca Solnit later built a book around, was that disasters provide “a temporary liberation from the worries, inhibitions, and anxieties associated with the past and future.” When everything is on fire, there is only now, and in the now, people turn out to be generous. Solnit’s A Paradise Built in Hell is a long record of it, the Mizpah Café among them.

The research supports my mom too. The solidarity is, in the hazards researcher Lori Peek’s words, “typically short-lived.” One review by Fran Norris and colleagues, summarising earlier fieldwork, puts it more bluntly: “the heightened level of helping and concern evident initially inevitably must cease.” Krzysztof Kaniasty and Norris measured the support survivors receive actually deteriorating afterwards. Practitioners describe the arc in phases: heroic, honeymoon, disillusionment. That is a rule of thumb, not a law, but the shape it draws is what this piece is about. It isn’t only the new car that wears off. So does the best in us.

The screen. Does repeated exposure to violence on screens dull the response to violence? Partly. The evidence here has to be read with care, because this is a field with a long and bitter argument.

What is solid is the body’s response. In a 2007 study, Nicholas Carnagey, Craig Anderson and Brad Bushman had students play violent or nonviolent video games for twenty minutes, then showed them ten minutes of real violence. The violent-game players showed lower heart rate and skin response while they watched. Barbara Krahé and colleagues found that people who habitually watched violent media showed smaller physiological responses to violent clips. The dulling was specific to violence; sad and funny clips were unaffected. Christopher Ferguson, the field’s most persistent critic, reanalysed the American Psychological Association’s own task-force data in 2020. He found negligible links between violent games and aggressive behaviour, but “stronger relationships with desensitization.”

What is not solid is the step from a dulled body to a crueller person. Krahé found that the desensitization did not predict aggression in the lab. The APA’s 2020 resolution states that “attributing violence to violent video gaming is not scientifically sound.” The psychologist Paul Slovic titled a paper with a line he attributes to Mother Teresa: “If I look at the mass I will never act. If I look at the one, I will.” He gathered evidence that compassion doesn’t scale with numbers: people gave more to help one sick child than eight. Two large replications in 2018 didn’t find the single-victim advantage. The honest version is narrow. Repeated exposure dulls the body’s alarm. Whether that makes anyone worse is not established.

III.What the Evidence Explains

This is where the story gets older and stranger than any of us. Psychology found hedonic adaptation in people, but people didn’t invent it.

Older than the brain. Physarum polycephalum is a slime mould: a single sprawling cell, bright yellow, with no neurons at all. In a 2016 experiment, Romain Boisseau, David Vogel and Audrey Dussutour set food on the far side of a bridge laced with something bitter but harmless: quinine, or caffeine. At first the mould balked and crept across slowly. Over five days it learned to ignore the bitterness and crossed at its normal pace. Two days away from the bitter bridge, and it recoiled again. And a mould that had learned to ignore quinine still balked at caffeine, so this wasn’t tiredness. It was learning. The authors called it “habituation, an unmistakable form of learning,” in an organism without a single nerve cell. A trumpet-shaped single-celled creature called Stentor does it too. Touch it repeatedly at the same force and, in the words of a 2023 study, “it will learn to ignore that stimulus.” The sea slug Aplysia, whose simple nervous system earned Eric Kandel a share of a Nobel Prize, pulls in its gill when touched, and pulls it in less and less as the touches repeat.

Sit with that for a moment. Among the oldest kinds of learning on Earth, older than brains, possibly as old as cells, is learning to stop noticing. Life worked out early that a world of constant stimulation can’t be met at full alarm. Whatever doesn’t change can be safely ignored. The treadmill isn’t a defect of modern life. It may be one of the first things life ever learned.

You see only because you tremble. It is in your eyes right now. In the 1950s, laboratories in England and America found ways to hold an image perfectly still on the retina, moving it exactly as the eye moved so it never shifted across the receptor cells. The image faded. One review describes what happened when all eye movement was cancelled: perception faded “to a homogeneous field.” In 1804 the Swiss physician Ignaz Troxler had already noticed a gentler version: fix your gaze on a point, and objects in your peripheral vision will dissolve into their background. You can try it on a demonstration figure, which carries the instruction: “After a few seconds, the annulus will disappear.”

So how do you see anything at all, if the visual system goes quiet on whatever doesn’t change? Your eyes never stop moving. Even when you think you are staring perfectly still, they make tiny involuntary jumps called microsaccades, every second or so, too small to notice. In 2006, Susana Martinez-Conde and her colleagues showed that these tremors keep the world from fading. Microsaccades became rarer just before a target faded from view and more frequent just before it returned. “If our eye was perfectly still during fixation,” she said, “the world would quickly fade from view.”

That is the most beautiful fact I found in all of this. The world doesn’t stay visible by itself. You keep it visible by trembling. The same is true further in, for everything you have: the house, the job, the person across the table. They don’t stay vivid on their own. Something has to keep moving.

From the eye to the heart. The theory of hedonic adaptation was born in exactly this place. The psychologist Harry Helson built what he called adaptation-level theory, which began as an attempt to explain colour vision. In light of a single colour, he found, things come to look as if they have no colour at all. The eye resets its idea of normal to whatever surrounds it. Brickman and Campbell’s 1971 essay on the hedonic treadmill appeared in a symposium volume devoted to Helson’s theory. Their idea, as Diener and his colleagues later summarised it, was that “processes similar to sensory adaptation” govern our emotional lives. Our feelings reset the way our noses stop smelling a room we have been in for an hour. Their essay had a title most people who cite it have never seen: “Hedonic Relativism and Planning the Good Society.” The founding paper on the treadmill was about whether a better world could make people happier.

The voice that goes quiet. In 1997 Wolfram Schultz, Peter Dayan and Read Montague described what dopamine neurons in monkeys actually respond to. Give a monkey a drop of juice it doesn’t expect, and the neurons fire. Teach it that a light comes before the juice, and the neuron, in the paper’s words, “fails to be activated by the predicted reward.” It fires at the light instead. If the light comes on and the juice doesn’t, the neurons fall silent, below their resting rate. The signal tracks the difference between what was expected and what arrived. A reward that is fully expected is, to this system, no news at all. The brain doesn’t keep the accounts. It keeps the news. The eye works the same way. What is constant goes quiet.

The correction this piece owes. The notes that started this Inquiry, and most of what you will read online, call dopamine “the pleasure chemical.” It isn’t, and the way we know is one of the loveliest experiments in the field.

Newborn babies, given a drop of something sweet, make a particular face. The tongue pushes out rhythmically and the lips relax. Given something bitter, they gape. The Israeli researcher Jacob Steiner documented this in the 1970s, and later work with Kent Berridge found the same expressions in great apes and other primates. Rats make a version too. Liking has a face, and it is very old.

Berridge and his colleague Terry Robinson used that face to take wanting and liking apart. Rats whose dopamine had been depleted by up to ninety-nine percent stopped seeking food. Left alone, they “will starve to death unless nourished artificially.” But put sugar in their mouths and they made the liking face, exactly as before. Mice engineered to have more dopamine than normal did the reverse. They worked harder and ran faster for sweet rewards, but their liking face was no bigger than anyone’s. Berridge and Robinson’s conclusion: “dopamine systems are necessary for ‘wanting’ incentives, but not for ‘liking’ them.” Wanting and liking feel like one thing from the inside, but they run on separate machinery. With repetition, wanting can grow stronger while liking stays the same. It is possible to want something more and more while enjoying it no more at all.

Why it exists. None of this is a design flaw. A creature that met every lasting condition at full intensity would be swamped. It would be the slime mould stuck forever at the bitter bridge, the eye blinded by its own steadiness. Marking change instead of level frees attention for what is new, and that is how animals stay alive. The same machinery gets people through grief; Gilbert’s psychological immune system is that mechanism on our side. John Vervaeke, in the line that gave this section’s opening piece its title, says the machinery that makes us adaptive is the machinery that makes us vulnerable. Hedonic adaptation may be its cleanest example.

Why rising together leaves us where we were. Some goods are valuable only because others don’t have them: the best neighbourhood, the top job, the uncrowded beach. The economist Fred Hirsch called them positional goods in 1976 and pointed out that economic growth can’t give everyone more of them, because their value is their scarcity. Robert Frank later described the result as a positional arms race. Each household’s extra spending makes sense for that household and is pointless for all of them together, because when everyone moves up, the rankings stay where they were. Put that together with Luttmer’s neighbours and a nervous system that marks change instead of level. The result is an economy built on growth that turns out, as a matter of course, people who have more and do not feel it.

The shrinking fish. In 1995 the fisheries scientist Daniel Pauly gave a name to something he saw in his own profession. Each generation of scientists takes the fish stocks it first encounters as the natural state, so each generation starts from a depleted baseline and never notices the loss. He called it shifting baseline syndrome.

Years later a graduate student named Loren McClenachan found the picture of it. In a library in Key West she found decades of photographs taken on charter fishing boats, sport fishermen standing on the dock beside the day’s trophy catch, from 1956 to 2007. In the earliest photos the boards are hung with enormous groupers and sharks nearly two metres long. The average trophy fish weighed about 20 kilograms. By 2007 the boards hold small snappers, and the average trophy weighed about 2. The trips cost the same, adjusted for inflation. And the people in the photographs look, as one reporter put it, “just as pleased.”

They are not wrong to be pleased. They caught the biggest fish there was. That’s what makes the photographs so hard to look at. Nobody in them is fooled, and nobody in them can see what’s missing. Lived experience fades, my mom wrote, and what is left are faded stories. The photographs are the stories. You can only see the fade if you lay them side by side.

The screens, as a contested question. Is any of this what is happening to young people on phones? The question is real, and the answer isn’t settled. Jonathan Haidt argues in The Anxious Generation (2024) that the move to a phone-based childhood drove the rise in teenage anxiety and depression. Amy Orben and Andrew Przybylski, analysing three large datasets covering more than 350,000 adolescents, found that digital technology use explained “at most 0.4%” of the variation in well-being. Candice Odgers, reviewing Haidt’s book in Nature, found “no evidence that using these platforms is rewiring children’s brains or driving an epidemic of mental illness.” The US National Academies’ 2023 review did not find that social media causes changes in adolescent health at the population level, and recommended action anyway. Serious people hold both positions. This piece takes neither.

Put the pieces together and the physical account is close to complete:

• a kind of learning older than brains;
• an eye that sees only what changes;
• a signal that goes quiet when the surprise is gone;
• a wanting system that can grow while liking doesn’t;
• a comparison machine that makes some goods worthless the moment everyone has them.

All of it is measurable, and none of it needs anything beyond living tissue and a society. Unlike most of what this section will take up, there is no mystery here about the mechanism. Sagan would have said that doesn’t make it any less wonderful. It makes it more so.

IV.What Remains

So the question is not whether hedonic adaptation is real. It is whether it is what I told my mom it was: the true culprit, the thing underneath most of the rest.

Here is that thesis at full strength. The treadmill turns gain into baseline. An economy that has to grow needs people who are never quite satisfied, and the treadmill supplies them, free and for ever. Positional competition turns private dissatisfaction into public waste. Rising aspiration turns enough into not-enough. Greed, hoarding, spending for status, and much of what wears people out in wealthy societies all run on it. If people could step off it, a great deal would change.

Now the case against it, which is strong.

First, losses don’t adapt the way gains do. The good news fades faster than the bad. Gains wear off quickly; unemployment, divorce and disability leave marks for years. A great deal of what drives people is not boredom with what they have but fear of losing it, a hunger for security rather than novelty. That is a different engine. Calling it hedonic adaptation stretches the term until it means everything.

Second, the dividing. The Map’s teaching on Right in Two is about creatures given a garden with enough for all, who cut everything in half and fight over the halves. Tribal identity, us against them, persists in societies that are prosperous and comfortable. Contentment doesn’t dissolve it.

Third, power. Some of the worst things people do are not about having more but about having power over others. That appetite does not go quiet when the stomach is full.

So the honest result is narrower. Hedonic adaptation is not the root of everything. It is one engine among several. But it is the one a growth economy is built to run on, and that makes it the one most worth understanding in wealthy societies today. That isn’t what I told my mom. It is what survives.

What slows the treadmill, and by how much. If adaptation were absolute, nothing would slow it. Some things measurably do. The honest report is that their effects are real, and small.

Kennon Sheldon and Sonja Lyubomirsky found that gains last longer for people who keep paying attention to them and keep appreciating them. They call appreciation “the psychological opposite of adaptation.” Their test was a short study with students.

Then there is George Bailey. In 2008 the psychologists Minkyung Koo, Sara Algoe, Timothy Wilson and Daniel Gilbert opened a paper with Frank Capra’s 1946 film It’s a Wonderful Life. In the film, an angel named Clarence shows a man on the edge of suicide the world as it would have been if he had never been born. They named their finding after him: “the George Bailey effect.” Across four studies, people who wrote about how a good thing in their life might never have happened felt better than people who wrote about how it came about. People in long relationships who imagined never having met their partner became more satisfied with the relationship. And when the researchers asked others to predict the results, most predicted the opposite. As the paper puts it, it isn’t necessary for an angel to show us. We can do it ourselves, and we don’t expect it to work. The effects were modest and came from a single sitting, but the direction is clear. The way to see what you have is to imagine it gone.

A 2016 meta-analysis of gratitude exercises found improvements in well-being of about d = .31 against doing nothing, .17 against a neutral activity, and essentially zero against other active exercises. Gratitude helps about as much as other things that help.

The loss in this section. One result is often cited as evidence that trained minds can step off the treadmill entirely. In 1966 two Japanese researchers, Akira Kasamatsu and Tomio Hirai, reported that Zen practitioners’ brain responses to a repeated click did not fade the way everyone else’s do. Every click registered as if it were the first. Later researchers note that the finding rests on three Zen masters. When Becker and Shapiro tested it again in 1981 with practitioners of Zen, yoga and Transcendental Meditation against controls, they found no difference. A 2015 study found a modest reduction in habituation among intensive practitioners and called the evidence tentative. I wanted that result to hold. This section reports it as a loss: there is no good evidence that anyone has been measured off the treadmill.

Unexplained is not inexplicable, and a gap in one account is not evidence for any other. Here the gap isn’t in the mechanism. The mechanism is well understood, down to the slime mould. What remains is a question the instruments were never built to answer. The research can measure how fast a gain fades, and how much attention slows it. It can’t say how much is enough. That isn’t a measurement. It’s a judgement about what a life is for. Everything That I Am put it as two orientations aimed at different targets with different tools. Here the empirical work has done its job completely. It has found the machinery, all the way down, and handed back the one question only a person, or a tradition, can answer.

V.What the Traditions Said

None of what follows is evidence. The claim is about the persistence of a description, not the truth of anyone’s metaphysics. Long before anyone measured a dopamine neuron, the traditions described this mechanism, named the trap, and built practices against it.

They described the mechanism. In the Mahabharata, King Yayati borrows his son’s youth and spends it on a thousand years of pleasure, and reports back: “Our desires, however, are never gratified by indulgence. On the other hand, with indulgence, they only flame up like fire with libations of sacrificial butter.” The Laws of Manu repeat it as a single line. Two thousand years later, Robinson and Berridge would describe wanting that sensitizes with use while liking does not. That is a resemblance, not a confirmation, and it is a striking one.

They gave it a body. Buddhist tradition imagined the hungry ghost, the preta, a being of enormous hunger who cannot be filled. The Dhammapada says “there is no satisfying lusts, even by a shower of gold pieces.” The famous image, a vast belly and a mouth the size of a needle’s eye, comes not from the earliest texts but from later Buddhist tradition, Chinese scripture and Tibetan painting, and the site credits it there. It is wanting without liking, painted as a creature.

They named the comparison. The Qur’an’s chapter called at-Takāthur opens, in E. H. Palmer’s 1880 translation, “The contention about numbers deludes you till ye visit the tombs!” Rivalry in piling up, until the grave: Luttmer’s neighbours, nearly fourteen centuries early. Jesus tells of a rich man who plans to pull down his barns and build greater ones, and is told that his life is required of him that night. Ecclesiastes, already on this Map, watches the rivers run into a sea that is never full, and says in the next verse that “the eye is not satisfied with seeing, nor the ear filled with hearing.” Qoheleth meant appetite. The laboratories found that it is also simply true of the eye.

They defined enough as an inside matter. The Mishnah asks, “Who is rich? He who rejoices in his portion.” The Tao Te Ching (in James Legge’s 1891 translation) says there is “no calamity greater than to be discontented with one’s lot.” Epicurus says “nothing is sufficient for him to whom what is sufficient seems little.” Mencius says “to nourish the mind there is nothing better than to make the desires few.” Seneca, writing to a friend, gives a rule: the proper limit to wealth is “first, to have what is necessary, and, second, to have what is enough.”

And they practised against it. This is where the traditions come closest to the laboratory. Seneca told his friend to set aside days to live on the cheapest food and roughest clothes, “saying to yourself the while: ‘Is this the condition that I feared?’” Epictetus told his students that when kissing a child or a wife, they should remember it is a human being they are kissing, one who can be lost. That is mental subtraction, nearly two thousand years before Koo and her colleagues tested it and found it worked better than people predicted. The Stoics didn’t know why it worked. The 2008 study doesn’t know whether it keeps working after a single afternoon. Both found the same lever.

And one tradition saw it across generations. In the Hindu funeral rites, the newly dead are pretas: hungry, and fed by the living with offerings of rice until they can become ancestors. The living feed the dead, and the dead are carried forward. Read beside Pauly and beside my mom’s sentence, it is a ritual technology against a shifting baseline: a way of keeping the past’s hunger and the past’s lessons from simply fading.

The persistence is the point. People with no instruments, in cultures that mostly never met, described a mechanism the instruments have since measured. They also did what the instruments cannot. They said what enough is.

What this Inquiry does not establish

1. 01That hedonic adaptation is the root of most human problems. It is one engine among several. Fear of loss, tribal identity and the will to power are not reducible to it.
2. 02That people return to a fixed baseline. Many don’t. Unemployment, divorce and disability leave lasting marks, and people differ widely.
3. 03That dopamine is pleasure, or that phones are “addictive” in a clinical sense. Dopamine tracks prediction and wanting. The evidence on social media and young people is contested, and this piece takes no side.
4. 04That media violence makes people violent. Repeated exposure dulls the body’s alarm response. A link to real-world violence is not established.
5. 05That gratitude, contemplation or practice can switch adaptation off. They slow it, modestly. No one has been measured off the treadmill.
6. 06That slime moulds, trembling eyes or monkeys waiting for juice tell us what a good life is. They show how old and how deep the mechanism runs. The images in this piece are the writer’s; the findings are the scientists’.
7. 07That the traditions were right because the science agrees with them. Their descriptions resemble the mechanism. Resemblance is not confirmation, and the question of what is enough is not one the evidence can settle for anyone.

The Sea Is Not FullThe Edgeimanantibody.com/edge/hedonic-adaptation

My mom ended our conversation in a place I couldn’t improve on. She wasn’t hopeful about what would come after a collapse, she said. “All I can do is be better myself.” She said my writing had a good effect on her. “I can choose a different path for myself.”

The evidence supports her more than it supports me. Not the part about collapse; nobody can measure that. The part about choosing.

Here is what I keep coming back to. Somewhere in the history of life, long before anything had a brain, living things learned to stop noticing what didn’t change. It kept them alive. It still does: it is why a widow can get out of bed, and why the world doesn’t overwhelm a newborn. But it means that nothing we have stays vivid by itself. The fish shrink and the smiles stay the same. Last year’s catastrophe is this year’s background. The kitchen in the park closes.

And yet the eye keeps the world visible by trembling, a small motion over and over that no one sees and no one decides. That is not a proof of anything. It is the best picture I have found of what the traditions call practice, and what the psychologists, more modestly, call attention: a small, repeated motion that keeps what is in front of you from fading. Imagine the thing gone, the way George Bailey had to. Rehearse the loss, the way the Stoics did. Keep moving, a little, so you can keep seeing.

The treadmill is real, its machinery is older than we are, and it is not the cause of everything. No one has been measured off it. But no one has to stand still on it either.

You sit with that. So do I.

This Inquiry stands on the Map’s own words. It adds eleven teachings: The Hungry Ghost, Yayati — Fire Fed with Butter, Feeding the Departed, The Sufficiency of Contentment, Who Is Rich?, The Bigger Barns, The Rivalry in Increase, What Is Enough, Nothing Is Sufficient, Make the Desires Few, and the bridge teaching, Knowing What Is Enough. It also draws on All Rivers Run to the Sea, Right in Two and The Same Machinery. It continues Everything That I Am, where this site first named hedonic adaptation and Sagan’s fight against it, and The Same Machinery, the opening piece of The Edge. Tool’s Vicarious opens 10,000 Days; the site reads the album in Not Like You.