Below, Nicholas Humphrey shares five key insights from his new book, Why Is the World So Beautiful?: Our Minds in Search of Nature’s Rhymes.
Nicholas is a theoretical psychologist and Emeritus Professor of Psychology at the London School of Economics. His research explores the evolution of intelligence and consciousness, including pioneering work on blindsight and the social function of intellect. He is the recipient of numerous honors, including the 2026 Dennett Prize by the International Center for Consciousness Studies.
What’s the Big Idea?
Our love of beauty is more than a matter of taste. It evolved to help us recognize patterns in the world, guiding us toward what is good for us and giving us pleasure in making sense of how things fit together.
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1. Why beauty?
I’m an evolutionary psychologist by trade. That means I look at the ways human beings behave and ask why: what good does it do them? A human trait can only have evolved if it helped our ancestors survive and reproduce.
The love of beauty is, in this respect, a puzzle. Humans everywhere do it: they collect beautiful seashells, sing beautiful songs, wear beautiful clothes, make beautiful art, and are thrilled by beautiful ideas. They do this to an extent that far exceeds anything other animals do. You don’t find dogs admiring a sunset or monkeys listening to a blackbird’s song. Something special about the human mind makes us crave beauty and go to great lengths to find or create it.
And yet it would seem—at first sight anyway—that much of this is pointless. It’s as if we love beauty merely for beauty’s sake. Evolutionary theory suggests this is very unlikely. The love of a beauty must be a clue, not a quirk.
2. A rhyme detector in our heads.
People apply the word “beautiful” to a wide range of things: a beautiful flower, a beautiful building, a beautiful mathematical proof. Many theorists have claimed that beauty really doesn’t refer to a single property—not one we can write down or measure.
Yet in 1865, the poet Gerard Manley Hopkins, while a student at Oxford, wrote an essay for his tutor in which he made a bold and interesting suggestion. All beauty, he proposed, “may by a metaphor be called rhyme.”
“Many theorists have claimed that beauty really doesn’t refer to a single property.”
This may not strike you immediately as either true or helpful. When you think of rhyme, you probably think of sound rhymes: The cat sat on the mat. Hardly a paradigm of beauty! But Hopkins uses the term much more broadly to mean any case where two things are alike but different. He begins his essay by discussing visual rhymes. He asks us to consider the leaves of a chestnut tree, which link to form the chestnut fan. He points out how each of the seven leaves is a variation of the same shape, with multiple lines of symmetry and mirror-reflection. It’s patterns of likeness and difference that appeal to us. In other domains—music, poetry, sculpture—he identifies rhyme as what makes things beautiful.
When I first read that essay, I was bowled over. Things I’d found beautiful without understanding why suddenly made sense. In my book, I offer a gallery of examples that fit Hopkins’s formula, from cloud formations to philosophical ideas to games of football. We do indeed have a “rhyme-detector” in our heads, and when it’s activated, it triggers an aesthetic emotion.
3. Rhyme is a guide to what’s worth having.
Why should being attracted to rhyme benefit our well-being? Evolutionary psychologists have focused on three domains of human life where we regularly rely on judgments of beauty to determine our life choices.
- Personal beauty: When a person has bodily features that rhyme—bilateral symmetry, harmonious proportions—or acts and speaks in ways that rhyme, they are likely to possess the traits we want in a partner or friend. Beauty here is a proxy for health and good character.
- Practical beauty: When a structure such as a bridge or building is made of rhyming parts, it is likely to be strong and resilient. The same goes for tools, utensils, and vehicles. The elegant design that pleases the eye tends to be the one that also works.
- Environmental beauty: When a natural landscape contains rhyming geographical features, rhyming plants and animals, it is likely to be a good place for humans to settle and flourish.
4. Rhyme is in the world’s DNA.
There’s an interesting convergence in personal, practical, and environmental beauty. It might seem surprising that we like the same features in a human partner that we do in a canoe or a handaxe or a fertile valley. But actually, it’s not surprising at all, for it turns out in every case we value rhyme as a sign of health and stability.
It’s almost a law of nature that things that are balanced and harmonious are relatively likely to endure—not just in the world of biology but in physics too. Things with internal rhymes tend to outlast the competition, so they are likely to accumulate. As the world develops through time, it comes to contain ever more things that correspond to stable arrangements of matter: clouds, oak trees, whirlpools, rabbits, castles. In English alone we have common nouns for 80,000 different kinds of thing: classes whose members bear a family resemblance to each other.
This suggests that we like seeing rhyme because we like examples of how the world is put together. It’s our world and we need to understand it. Rhyme provides a kind of training set for the mind, helping us recognize things that belong together.
So, we can add a fourth domain of beauty which we have evolved to be attracted to:
- Cognitive beauty: When patterns help us make sense of the world.
5. Beauty has a moral dimension—and maybe a divine one.
Hopkins himself admitted that something is missing from his theory that all beauty may be called rhyme. I’ve come to believe that what he left out was that the experience of beauty has a moral or ethical dimension.
It has often been remarked that in the case of man-made works of art, we feel emotionally connected to the artist. We marvel at the way they have got it right. But here’s what doesn’t fit: we can feel the same emotion when confronted by a natural spectacle. We see it in a rainbow arching across the sky or hear it in waves lapping on the shore or in the smell of honeysuckle on a breeze—we still feel that somebody or something has got it right.
“Wherever we see evidence of beautiful design, we can’t help imagining that an intelligent designer is responsible.”
The reason, I believe, lies in the fact that humans are natural-born creationists. Wherever we see evidence of beautiful design, we can’t help imagining that an intelligent designer is responsible. Even if we don’t explicitly think of the creator as God, we nonetheless relate emotionally to who or whatever has created the beauties of nature as if to a supremely generous and gifted artist.
Why is the world so beautiful? It’s largely down to us and our uniquely human moral sentiments. Dogs don’t love sunsets because they just don’t think that way. We do—and that, in the end, is what makes us the strange, beauty-seeking creatures we are.
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