Is the World Made of Tiny Balls or Flickering Flashes?

Can You Cut a Grain of Sand Forever?

You pick up a grain of sand and split it with the sharpest knife you own. Then you split one of the halves, and again. Could you keep halving it forever? If you could, every grain would contain an infinite number of pieces — and a mustard seed would have just as many parts as a whole mountain. That would make “big” and “small” meaningless. To many ancient thinkers, this was a huge problem.

In both classical India and ancient Greece, philosophers responded by saying that division cannot go on forever. At some point you reach a smallest possible piece — an atom (from the Greek word atomos, “uncuttable,” and the Sanskrit aṇu or paramāṇu, meaning “extreme smallness”). An atom is the absolute floor of reality, a partless unit that cannot be cracked open. This simple idea solved another famous puzzle: the Greek thinker Zeno of Elea (5th century BCE) had argued that if space and time are infinitely divisible, motion would be impossible — to cross a room you’d need to complete an endless number of tiny tasks. Atomists countered that space comes in smallest jumps, so motion only requires a finite number of steps. The drive to avoid these paradoxes pushed atomism into the centre of ancient philosophy. But once you say the world is made of atoms, you immediately face a harder question: what kind of things are they?

India’s Solid Atoms: Earth, Water, Fire, Air

The Nyāya and Vaiśeṣika schools of Indian philosophy (developing from roughly 800 BCE onward, with key texts by Gautama around 150 CE and Vātsyāyana around 400 CE) gave a bold answer. Atoms are real, lasting material substances. There is not just one kind of atom — there are atoms of earth, water, fire, and air. Each kind carries its own sensible qualities: water atoms are cold and viscous, fire atoms are hot, earth atoms are dry and solid. When you dip your hand in a stream, it feels cold because countless cold atoms are pressing against your skin.

Because each atom is partless, a puzzle arises: how can two atoms be “next to each other” without merging into a single point? The Nyāya-Vaiśeṣika reply is that atoms are tangible bodies — they cannot occupy the same space, so they line up side by side like bricks, first forming tiny invisible pairs and triads, and only then building up into objects large enough to see. This school insisted that a composite object (like a clay pot) is more than just a heap of atoms; it is a genuine new thing with its own reality. Later Nyāya thinkers, such as Udayana (11th century CE), even used the organised arrangement of atoms as a proof that a divine intelligence must exist to set them in order.

Buddhist Atoms: The World as a Flickering Movie

Buddhist philosophers took atomism in a startlingly different direction. For them, atoms are not tiny bricks that endure through time. The ultimate constituents of reality are dharmas (or dhammas), which are momentary events — brief, irreducible flashes of existence. A dharma is not a thing that has properties; it simply is a property-instance, like a flash of coldness or a spike of blueness, lasting only an instant before vanishing. Think of a film: what looks like a continuous moving picture is actually a rapid sequence of still frames. In the same way, Buddhist thinkers such as Dharmasri (2nd century CE) and Vasubandhu (5th century CE) argued that our everyday world of solid objects is really a fast-flowing stream of atomic moments.

This view leads to a striking conclusion: there is no permanent “clay” that holds a pot’s colour and weight together. A red, heavy jar is just a bundle of momentary red-flashes and heavy-flashes occurring together. Composites are mere collections — they don’t acquire any extra reality beyond the momentary atoms that make them up. The goal of this philosophy was not just to understand matter, but to help people see that clinging to stable things causes suffering, because nothing solid actually exists.

Bouncing Through the Void: The Greek Atomists

Thousands of miles to the west, Greek philosophers built a different atom machine. Leucippus (5th century BCE) and his student Democritus (5th century BCE) declared that only two things exist: atoms and the void (pure empty space). Atoms are indestructible, solid, and eternally whirling through an infinite void. They differ only in size, shape, order, and position — never in colour, taste, or temperature. Some atoms are smooth spheres; others have sharp edges or tiny hooks and barbs that let them snag together and form temporary clusters.

Democritus offered a breathtakingly vivid account of perception. Objects constantly shed thin films of atoms; when these films hit your eyes, tongue, or skin, they cause sensations. Sweet taste comes from smooth round atoms gliding over your tongue. Bitter taste comes from jagged atoms that tear at your flesh. Colour is caused by the “turning” or arrangement of atoms. Yet Democritus also drew a famous, unsettling line, claiming that sweet and bitter are just conventions, while reality is made of atoms and void. The tastes and colours you experience are not really in the objects — they exist only in your mind’s interaction with the films. But this raised a deep self-doubt: if your senses are the only way you learn about the world, and they mislead you into thinking sweetness is “out there,” can you ever trust them to reveal the truth about atoms? The senses, Democritus admitted, could turn around and accuse the mind of sawing off the branch it sits on.

Epicurus Tweaks the Machine: Atoms With a Swerve

Epicurus (341–270 BCE) loved the atomist picture but hated the sceptical despair it seemed to invite. He wanted a theory that would help ordinary people live without anxiety. So he retooled Democritus’s atoms. First, he gave them a built-in downward fall — a natural direction of motion through the infinite void. Second, he added a tiny, random swerve: occasionally, for no reason at all, an atom drifts slightly to the side. This swerve lets atoms collide and weave into worlds. (Later followers, like the Roman poet Lucretius, even suggested the swerve might explain free choice — a spark of unpredictability inside us.)

Crucially, Epicurus argued that all sense perceptions are true as causal events: every time a film of atoms bumps into your eye, that bump really happened. The mistake comes only when your mind rushes to judge what caused it. So the sweet taste in your mouth is a real, reliable event — you simply shouldn’t leap to the conclusion that the lemon itself contains “sweetness.” Properties are real patterns in the atomic films, not mere illusions. This allowed Epicurus to build a whole philosophy of peace: once you understand that the gods did not design the world and that your soul dissolves into atoms at death, you can stop being afraid. The good life becomes a matter of enjoying natural pleasures with friends, free from imaginary terrors.

The Unseen Fight That Turns Tables into Puzzles

We no longer think of atoms as tiny hooks and barbs. But the old fight between the Indian and Greek atomists is not over; it has simply changed languages. The Nyāya realists believed that a whole object (a forest, a table) is something genuinely new, not just a pile of atoms. The Buddhist side said that a whole is nothing but its momentary flashes — a swarm, not a solid. The Greek Democriteans insisted that the world of tastes and colours is a mental show, while Epicurus tried to keep perception trustworthy enough to live by.

You can feel this debate every time you touch a wooden table. Your senses scream “solid, continuous stuff.” Science whispers, “mostly empty space, held together by invisible forces.” Are you feeling the table itself, or a story your brain constructs from bouncing particles? And if your senses can be so wrong about a table, how much can you trust them about bigger things — justice, beauty, the people you love? The ancient atomists knew that the smallest question can shake the biggest ones. That is why they kept arguing, and why we still do.

Think about it

1. If you had a magic knife that could cut anything, do you think you’d eventually reach a piece that can’t be cut any smaller? Why or why not?
2. When you bite into a lemon, you taste sour. Is that sourness really in the lemon — or only in your mouth? How could you decide?
3. Imagine you see a movie on a screen. Is the movie just a rapid series of still frames, or is the motion itself something real? Does your answer change how you think about the world around you?