Nothing.

Definition

What, exactly, is nothing?

(Yes, we just used 47 words to define the concept that requires zero. You're welcome.)

This turns out to be a surprisingly hard question. The word "nothing" is used casually dozens of times a day — "nothing to worry about," "there's nothing in the fridge," "I did nothing all weekend" — and yet when you try to pin down what nothing actually is, it slips away. The moment you think about nothing, you've already filled it with something: a thought.

Linguistically, "nothing" is a compound of "no" and "thing" — a negation applied to the concept of a thing. But things are the only raw material language has. We define almost everything by reference to other things. Nothing is language eating its own tail.

There are at least three distinct flavors of nothing worth distinguishing. There is the empty set — nothing in a mathematical container. There is the vacuum — nothing in a physical space. And there is absolute nonexistence — the absence of space, time, matter, and even the laws that govern them. Each is more radical than the last, and philosophers and physicists have argued about all three for millennia.

Nothing will come of nothing. Speak again.

— King Lear, William Shakespeare (1606)

Even Shakespeare's Lear, commanding his daughter to justify her love with flattery, stumbles into the philosophical trap: can something come from nothing? The answer, depending on who you ask, is: definitely not, definitely yes, or the question itself is ill-formed. We will explore all three.

Philosophy

Two and a half thousand years of arguing about nothing

The ancient Greeks were among the first to take nothing seriously as a philosophical problem — and the first to conclude it didn't exist. Parmenides (c. 515–450 BCE) basically said: "You can't think about nothing, therefore it doesn't exist." Bold move, especially for a guy whose entire philosophy is one long paradox. You cannot think of what is not, because the moment you think it, it becomes something: a thought. Therefore: nothing doesn't exist. Problem solved. Meeting adjourned. (The Greeks went home. Philosophers have been arguing about it ever since. Respect.)

Aristotle partially agreed and partially did not, which is very on-brand for Aristotle. He accepted that a pure, absolute void was impossible, but carved out conceptual space for "privation" — the absence of a quality in something that could have it. A blind eye is not nothing; it is an eye with the privation of sight. Aristotle's nothing is always nothing-in-relation-to-something. It requires a host. It is, in this sense, parasitic.

Leibniz's question is perhaps the single most famous question in metaphysics. It feels simple. It is not. The question assumes that "nothing" is the natural default — that existence requires explanation but non-existence does not. But why should that be true? Perhaps existence is the default and nothing is the anomaly. Perhaps the question is malformed. Perhaps asking "why" already presupposes a framework of cause and effect that only makes sense inside a universe. To ask why there is a universe may be like asking what is north of the North Pole.

Hegel looked at Being and Nothing and went: "Actually, they're the same thing in a very sophisticated way." Classic German philosopher move: take two opposites and declare them identical so the rest of us feel dumb. The interaction between Being and Nothing generates Becoming, which is how Hegel gets the entire universe out of a dialectical standoff between something and nothing. Most philosophers find this move infuriating. Some find it brilliant. A few find it both simultaneously, which is probably the correct response.

Heidegger, in his 1929 lecture What is Metaphysics?, asked "What about this Nothing?" and proceeded to argue that the Nothing "nothings" (das Nichts nichtet). The Nothing is not a passive absence but an active force — we encounter it in profound anxiety, in the experience of Angst, when the world as a whole slips away and we are confronted with pure being-in-the-world against the backdrop of nothing. Sartre loved this. Carnap, the logical positivist, thought it was complete nonsense and said so at some length. Heidegger's greatest hit: "The nothing nothings." He wrote an entire essay on this. Somewhere in the afterlife he's still waiting for someone to clap.

The Nothing nothings. This seemingly absurd statement is actually the most profound thing that can be said about it.

— Martin Heidegger, What is Metaphysics? (1929)

Jean-Paul Sartre claimed nothingness is what makes us free. Translation: your crushing anxiety is a feature, not a bug. Thanks, Jean-Paul, very cool. In Being and Nothingness (1943), he argued that human consciousness is defined precisely by its ability to negate — to imagine what is not, to project into a future that doesn't yet exist, to compare reality with an ideal. We are the beings through whom Nothing comes into the world. The rock just is. The human being is always haunted by what it is not, what it could be, what it refuses to be. Freedom, for Sartre, is nothing — literally. It is the gap between stimulus and response, the space in which choice lives.

Buddhism has a rather different take. The concept of śūnyatā (emptiness) in Mahayana Buddhism holds that all phenomena lack inherent, independent existence — they are "empty" of self-nature. This is not nihilism; the world still appears and functions. But its appearance is not grounded in any fundamental, fixed essence. Nothing, here, is not a horror or a problem. It is the precondition for change, compassion, and liberation. When the Heart Sutra says "form is emptiness, emptiness is form," it is making a claim about interdependence — that things exist only in relation to each other, never in isolation. Nothing is the space in which everything breathes. Finally, a tradition that looks at the universe and says, "Yeah, same."

Science

Nothing, according to physics (it's complicated)

You might hope that physics, with its equations and experiments, would give us a cleaner answer than philosophy. It does not. It gives us a stranger one.

Classical physics was comfortable with the idea of a vacuum: empty space, devoid of matter. Descartes denied it; Newton accepted it. For Newton, space was the absolute void through which matter moved — an empty stage. For a while, this worked fine.

Then came quantum mechanics, and nothing was never the same again. Physicists love to ruin everything. They took "nothing" and turned it into the quantum vacuum — a seething froth of virtual particle-antiparticle pairs constantly flickering in and out of existence like they're late for a very tiny party. It's nothing, but make it extra. This is not a theoretical curiosity. The Casimir effect, measured experimentally in 1997, demonstrates that two uncharged metal plates placed very close together in a vacuum will be pushed toward each other by the pressure of virtual photons — the measurable force of empty space. Nothing, it turns out, pushes.

Zero deserves its own paragraph. The mathematical concept of zero — a number representing nothing — was invented (or discovered, depending on your philosophy of mathematics) independently in ancient India and among the Maya, and was conspicuously absent from the otherwise sophisticated mathematics of the Greeks and Romans. It arrived in Europe via Arabic mathematicians in the Middle Ages and was regarded with deep suspicion. You cannot have none of something, argued the skeptics. None is not a number, it is an absence of numbers. They were wrong, and their wrongness gave us calculus, computing, and the entire digital world. Zero: the number that represents nothing and yet somehow holds mathematics together. It's the participation trophy of numbers. Every binary digit that has ever represented a thought, a song, a film, or a financial transaction is made of ones and zeros — being and nothing, alternating, at incomprehensible speed.

The Big Bang raises the deepest version of the nothing problem. Cosmologists describe the universe as having begun approximately 13.8 billion years ago in an extremely hot, dense state. But what was there before? The honest answer is: the question may be meaningless. Time itself began at the Big Bang; asking what happened "before" is like asking what is south of the South Pole. Stephen Hawking's no-boundary proposal suggests the universe has no beginning in time — that time near the Big Bang behaves like a spatial dimension and simply curves back on itself. There was no moment of creation out of nothing, because there was no "before" to be nothing in. Some physicists, like Lawrence Krauss, argue that the universe did come from nothing, but mean by "nothing" the quantum vacuum — which, as we have established, is not nothing. The Big Bang: nature's version of "watch this" right before the ultimate mic drop. Philosophers of physics have opinions about this, and those opinions are strongly held.

Examples

A taxonomy of nothings

Not all nothings are created equal. Here is a partial catalog of the varieties of nothing encountered in everyday life, ranked loosely from least to most existentially destabilizing.

There are also cultural nothings worth noting: the rest in music, which is as important as the notes around it; the pause in speech, which can mean more than words; white space in design, without which text becomes unreadable; the interval between heartbeats; the moment of silence held for the dead. Nothing, in these contexts, is not an absence but a presence — a structural element that gives meaning to everything surrounding it by virtue of not being it.

I am so glad there is such a thing as silence. I did not know it was possible before I came here.

— Maggie Nelson, Bluets (2009)

Musings

Further thoughts on nothing, in no particular order

If you removed all the empty space from every atom in every human being on Earth, the entire human race would fit in a cube roughly the size of a sugar cube. We are, structurally speaking, almost entirely nothing. The solidity you feel — your hand on a table, your feet on the floor — is electromagnetic repulsion between electron clouds. You are not touching the table. You are floating, imperceptibly, above it, repelled by the same force that repels the table from you. Nothing keeps you from passing through the floor. Nothing is load-bearing.

The number zero was controversial for religious reasons as well as mathematical ones. Medieval European scholars, working within a Christian framework, associated the void with chaos, the devil, or the formlessness that preceded creation. A number for nothing was dangerous — it implied that nothing was real, quantifiable, something you could do arithmetic with. The Church was not enthusiastic. Zero arrived in Europe anyway, which says something about the relative powers of theological objection and mercantile accounting.

In literature, nothing is a rich vein. Shakespeare's King Lear is structurally organized around the concept — Lear gives everything away and receives nothing in return, descends into nothing (madness, the storm, the heath), and the play's bleakest reading is that nothing means nothing: that the universe is indifferent, that suffering has no redemptive arc, that Cordelia dies for no reason and the good are not rewarded. Samuel Beckett took this further and built a career from it. Waiting for Godot (1953) is a play in which nothing happens, twice. The characters wait. Godot does not come. They consider leaving. They do not leave. They will return tomorrow and wait again. Beckett wrote in a letter that the play was "striving towards the nothing" — and he meant it as a description of human life in general, not just the play.

Douglas Adams, slightly more cheerfully, gave us the Total Perspective Vortex — a machine that shows you the entire universe and your infinitesimal place in it, which drives anyone who enters it instantly mad from the comprehension of their own insignificance. The punchline is that Zaphod Beeblebrox survives it unscathed, because he was in a simulated universe made just for him, in which he genuinely was the most important thing. The joke is that the only protection against the void is a universe-sized ego. Adams wrote funnier philosophy than most philosophers.

There is a strong case to be made that creativity depends on nothing. The jazz musician's rest, the sculptor's negative space, the writer's ellipsis — the absence is where the imagination completes the work. Art that leaves no gaps leaves no room for the audience. Nothing is the invitation to participate. It is the space the viewer brings themselves to. You cannot have a conversation without pauses. You cannot have music without silence. You cannot have form without void. Nothing is generative. Nothing is, in this sense, necessary.

Nothing is more real than nothing.

— Samuel Beckett, Malone Dies (1951)

One final thought: the concept of nothing may be uniquely human. As far as we know, no other animal thinks about the absence of things in the abstract. A dog notices that its food bowl is empty, but does not lie awake contemplating the heat death of the universe. The capacity to imagine nothing — to hold in mind not just the world as it is but the world as it is not, could be, was, or might never be — is the same capacity that gives us language, art, grief, hope, and existential dread. We are the animals haunted by nothing. It is possibly our greatest distinction. It is certainly our greatest burden.

And yet here we are, thinking about it. Which is, when you think about it, something.

Conclusion

In conclusion