The Universe in a Seed: Anaxagoras and the Question of What Things Are Made Of

Imagine you’re eating a piece of bread. You chew it, swallow it, and somehow—impossibly—it turns into you. The bread becomes your muscles, your bones, your hair, your blood. If you think about it, this is deeply strange. The bread wasn’t alive, and now it’s part of something alive. Where did your hair come from, if it wasn’t in the bread?

A philosopher named Anaxagoras, living in Greece about 2,500 years ago, looked at this problem and decided that most people were getting the whole story backwards. He thought: maybe things don’t actually become other things. Maybe they just are other things, all mixed together, and what we call “change” is really just ingredients reshuffling.

This led him to build a picture of the entire universe that still startles people today.

The Problem with Change

Before Anaxagoras, another philosopher named Parmenides had made a disturbing argument. He said: think about what it means for something to come into existence. If a thing comes to be, it must come from something. But if it comes from something that already exists, then it didn’t really come from nothing—it was already there in some form. And if you try to say it comes from nothing, well, nothing can’t produce something. Therefore, Parmenides concluded, nothing truly comes to be or passes away. Change as we think of it is an illusion.

This sounds like a clever trick with words, but Anaxagoras took it seriously. He agreed that real coming-into-being and passing-away were impossible. So how do we explain the fact that bread turns into hair, a seed turns into a tree, and winter turns into spring?

Anaxagoras’ answer: nothing ever genuinely changes. What looks like change is really just things rearranging themselves.

Everything in Everything

Here’s where it gets wild. Anaxagoras claimed that in everything there is a share of everything. Not just some things. Everything.

The bread you eat doesn’t become hair—it already contains hair, along with bone, flesh, blood, and every other ingredient that makes up a living body. These ingredients are present in such tiny amounts that you can’t see them, taste them, or detect them in any way. But they’re there. When you eat the bread, your body simply pulls out the ingredients it needs and concentrates them. The “making” of hair is really the uncovering of hair, pulling it out of the mix where it was hidden.

Anaxagoras thought this applied to everything, not just living things. If a puddle of water dries up and disappears, that water isn’t really gone. It’s mixed into the air and the ground, submerged but still there. If a piece of ice melts, the cold doesn’t cease to exist—it gets diluted into the surrounding water. If a plant grows from soil, the plant was already present in the soil in some invisible form.

This is called the “Everything in Everything” principle, and it’s one of the boldest claims anyone has ever made about what reality is like.

No Smallest Bit

If you keep cutting something in half, do you eventually reach a smallest piece that can’t be cut further? Most people throughout history said yes. Anaxagoras said no.

He argued that there is no smallest anything. For every tiny bit you find, there’s an even tinier bit inside it. And for every large thing, there’s a larger one. This isn’t just a statement about physical cutting—it’s a necessary consequence of his system. If there were a smallest bit of something, you could in theory separate it out from everything else. But if you could separate it out, you’d have a pure sample of that thing, all by itself. And that would mean something had genuinely come into existence that wasn’t there before—which violates the rule against real change.

So for Anaxagoras, the universe is like an infinite set of Russian dolls, with smaller ingredients nested inside larger ones forever. No matter how much you concentrate an ingredient, there’s always a trace of everything else mixed in. Pure gold doesn’t exist. Pure water doesn’t exist. Pure anything doesn’t exist. Everything is always a mixture.

The Mind That Moves Everything

Anaxagoras thought the universe began as an unlimited, motionless mixture of all ingredients, all blended together. Nothing was separated out. It was like a cosmic smoothie with every possible taste, color, texture, and substance stirred in.

Then something happened. Anaxagoras called it Nous (pronounced “noose”), which means Mind or Intellect. This Mind is the only thing in the universe that is not mixed with anything else. It’s pure, fine, and powerful. It started the whole mixture spinning.

The rotation began in a tiny area and spread outward, like a whirlpool growing in still water. As it spun, it began to separate the ingredients—not completely, but enough to create differences. Heavy things (like earth and metals) got pushed toward the center. Light things (like air and fire) got flung outward. This process is still happening today, according to Anaxagoras. The rotation continues, and it will continue forever.

But here’s what’s interesting and frustrating about Anaxagoras’ Mind. He claimed that Mind set everything in motion and ordered the universe. But he never explained why Mind did it, or why things ended up the way they did, rather than some other way. Socrates, who came a generation later, was excited when he first heard about Anaxagoras’ Mind. He thought this was going to be a philosopher who could explain that everything happens for the best reason. But then he read more and was disappointed. Anaxagoras used Mind to start the motion, but then explained everything else mechanically—whirlpools, pressures, separations—without any account of why these arrangements were good or what purpose they served.

This argument still matters. When you look at the universe and ask “Why is it like this?” are you looking for mechanical causes (what pushed what) or for reasons (what purpose it serves)? Anaxagoras gave us a little of both, and philosophers still argue about whether he was right to do so.

What Makes Something What It Is?

Anaxagoras faced a tricky question. If everything contains everything, then how can we say that anything is anything at all? If my hand contains bone, blood, skin, and every other ingredient, why do I call it a “hand” and not a “pile of ingredients”?

His answer became known as the Principle of Predominance. A thing is what it is because of which ingredients predominate in it—which ones are most present. My hand is a hand because hand-stuff predominates over the bone, blood, and other ingredients present. A piece of gold is gold because gold-ingredient predominates over everything else mixed into it.

But remember: there is no pure gold, no pure hand, no pure anything. So “predominance” means being the most prominent ingredient in a mixture, not being pure. And this creates a puzzle that still bothers philosophers: if nothing is ever pure, how can we really know what anything is? Our senses tell us “this is gold,” but our reasoning tells us “there’s also silver and copper and everything else in there.” Which should we trust?

Anaxagoras thought the senses were weak. He said, “Owing to feebleness of the senses, we are not able to determine the truth.” But he also said that “appearances are a sight of the unseen”—meaning that by using our senses as a starting point, and then thinking carefully, we can come to understand the hidden ingredients that make up the world. So the senses aren’t useless, but they need to be corrected by reason.

Other Worlds?

One of the strangest parts of Anaxagoras’ writing is a fragment where he suggests that there could be other worlds just like ours, with cities, suns, moons, and people. He says that the same processes of separation and mixing that produced our world could also happen elsewhere.

Some scholars think he meant other worlds literally—maybe on other planets or in other parts of the universe. Others think he was just doing a thought experiment, saying “if the same rules apply, the same results would follow.” Still others think he meant that within every part of the mixture—even within us—there are tiny worlds within worlds, containing all the ingredients needed to form complete systems.

Nobody knows for sure what Anaxagoras meant. But the idea that our world might not be the only one, and that the same natural laws might create life and order elsewhere, is still a live question in astronomy and philosophy today.

Why This Still Matters

Anaxagoras was trying to solve a problem that every scientific theory faces: how do you explain change without contradicting yourself? If you say that something new comes into existence, where did it come from? If you say that something is destroyed, where did it go? Modern physics deals with this by talking about conservation of matter and energy—the idea that stuff can change form but never be created or destroyed. Anaxagoras didn’t have modern physics, but he arrived at a similar insight using only logic and observation.

His idea that everything contains everything, while strange, raises a deep question: what counts as a “basic” ingredient of reality? Are the fundamental things of the universe tiny particles, like atoms? Or are they qualities like hot and cold, wet and dry? Or are they stuffs like flesh, bone, and wood? Anaxagoras thought the answer was “all of the above”—that the basic ingredients include both qualities and stuffs, and they’re all always present everywhere.

This picture of reality—a plenum, a fullness, where nothing is ever absent and nothing is ever alone—is radically different from the picture most of us carry around. We tend to think of the world as made of separate objects with clear boundaries. Anaxagoras thought boundaries were illusions, and that underneath everything, we’re all connected in a single, infinite, mixed-together stew of ingredients.

Philosophers still debate whether he was right. But the questions he asked—about what it means for something to change, about what things are really made of, and about how mind relates to matter—are still very much alive.

Key Terms

Term	What it means in this debate
Nous (Mind/Intellect)	The pure, unmixed force that starts the universe spinning and controls all living things
Everything in Everything	The claim that every basic ingredient is present in every part of the mixture, at all times
No Smallest or Largest	The claim that there is no lower or upper limit on how concentrated or diluted an ingredient can be
Principle of Predominance	The claim that a thing gets its identity from which ingredients are most concentrated in it
Ingredients	The basic, eternal, real stuffs (like hot, cold, flesh, bone, wet, dry) that mix together to make everything
Natural Constructs	Temporary things like plants, animals, and mountains that are made from ingredients but aren’t themselves basic real things

Key People

Anaxagoras (c. 500–428 BCE) – A philosopher from Clazomenae (modern Turkey) who moved to Athens and argued that everything is in everything, and that Mind set the universe in motion. He was charged with impiety for claiming the sun was a hot rock and had to flee the city.
Parmenides (c. 515–450 BCE) – An earlier philosopher who argued that change is impossible and that what-is cannot come from what-is-not. Anaxagoras accepted the core of his argument but tried to save the appearances by reinterpreting change as mixing and separating.
Socrates (469–399 BCE) – A later Athenian philosopher who was initially excited about Anaxagoras’ idea of Mind but became disappointed when Anaxagoras didn’t use it to explain why things are best arranged as they are.

Things to Think About

If everything contains everything, then you contain a tiny bit of everything in the universe—rocks, clouds, stars, wood, other people. Does this change how you think about what you are? Does it make any practical difference?
Anaxagoras thought that what we see with our senses needs to be corrected by reason. When should you trust what you see, and when should you trust what you figure out by thinking? Can you think of examples where your senses trick you, and only reasoning reveals the truth?
The Principle of Predominance says that a thing is what it is because of which ingredients dominate in it. But if the proportions keep shifting, at what point does something stop being one thing and become another? When does a “mostly water” mixture become “mostly muddy”? Is there a sharp line, or is it gradual?
Anaxagoras introduced Mind as the cause of motion but then explained everything mechanically. Do you think this is a failure of his theory, or is there something right about saying “the universe started for reasons we can’t understand, but after that, it runs on its own”?

Where This Shows Up

Modern science: The idea that matter can’t be created or destroyed (conservation of mass/energy) echoes Anaxagoras’ rejection of real coming-to-be. So does the idea that complex things emerge from simpler ingredients rearranging themselves.
Ecology: The insight that everything is connected to everything else, and that nothing is ever truly “wasted” or “gone,” is central to how ecosystems work.
Artificial intelligence: Anaxagoras’ question about whether Mind is a special thing separate from matter, or just another kind of ingredient, is still debated when people ask whether computers could ever genuinely think.
Everyday experience: When you eat food and your body uses it, you’re experiencing Anaxagoras’ puzzle firsthand. When people argue about whether “nothing comes from nothing” or whether change is real, they’re rethinking his ideas.