Homer had no word for blue. Neither did anyone else, for a very long time.
In 1858, William Gladstone (yes, the future Prime Minister, the one with the complicated relationship to slavery abolition) sat down with the Iliad and the Odyssey and did something nobody had thought to do. He counted the colors.
He found black mentioned almost 200 times. White about 100. Red, maybe 15. Yellow and green, fewer than 10 each. Blue? Zero. Not once. Not the sky, not the sea, not anything. Homer describes the sea as "wine-dark." He calls honey "green." He calls sheep "violet." The sky isn't blue. It isn't really any color at all.
Gladstone assumed the Greeks were partially colorblind. A whole civilization, squinting at the Aegean like it was a Merlot. He was wrong, but in an interesting way.
A philologist named Lazarus Geiger picked up where Gladstone left off and checked every ancient text he could find. Icelandic sagas. The Koran. Ancient Chinese stories. Hindu Vedic hymns, which have over 10,000 verses and describe the sky in elaborate detail. No blue. Nowhere. The Vedic hymns talk about the heavens constantly without once mentioning their color.
Geiger found something else. Across all these unrelated languages and traditions, colors seemed to appear in the same order. Every language has words for dark and light. If a language has a third color term, it's always red. Then yellow and green show up (in either order). Blue comes later. Always later.
A century after Geiger, two Berkeley linguists named Brent Berlin and Paul Kay tested this systematically. In 1969, they surveyed 98 languages and published Basic Color Terms, which confirmed the hierarchy and made everybody angry.
The hierarchy isn't perfect. Linguists have been fighting about the edges for fifty years. But the broad pattern holds across hundreds of languages with no shared ancestry. Dark and light first. Red next. Blue late.
Here's where it gets uncomfortable. If you don't have a word for a color, can you still see it?
Obviously yes. The Greeks weren't stumbling around wondering why the sky looked the same as the sea which looked the same as the grass. Their eyes worked fine. The photoreceptors in a human retina don't care what language you speak.
But "seeing" isn't the same as "noticing." And "noticing" isn't the same as "distinguishing quickly."
Russian has two basic words for blue: siniy (dark blue) and goluboy (light blue). These aren't like "dark blue" and "light blue" in English, where we're just sticking an adjective on. They're as fundamentally different to a Russian speaker as red and pink are to you. In 2007, a study at MIT showed Russian speakers were faster at distinguishing light blue from dark blue than English speakers were. Not by a lot. Maybe 100 milliseconds. But consistently, measurably faster, in a way that vanished when you gave them a verbal task to occupy the language centers of their brain.
Language doesn't change what your eyes detect. But it changes what your brain does with the signal. It changes where you draw the lines.
The Himba people of northern Namibia have a color system where green gets very fine distinctions but there's no separate term for blue. Researchers showed Himba speakers a circle of colored squares: eleven green, one blue. English speakers spot the blue square instantly. Himba speakers struggle with it. Takes them longer, and they make more mistakes.
But flip the test. Show a circle of greens where one square is a slightly different shade. Himba speakers find it immediately. English speakers sit there staring, seeing nothing but green.
Your language carved the spectrum into buckets, and your brain got lazy about differences within the same bucket. The boundaries feel natural, like they were always there. They weren't.
The Egyptians had a word for blue thousands of years before the Greeks. They also had Egyptian blue, the oldest known synthetic pigment, which they were manufacturing by 2500 BCE. The Mesopotamians had lapis lazuli, imported at enormous expense from Afghanistan. When you're trading a rock across two thousand miles of desert, you come up with a name for its color pretty quickly.
This might be the whole story. Not that ancient people couldn't see blue, or that their brains were different. Just that blue is rare in nature. Really rare. There are almost no blue foods. Blue animals are uncommon and mostly use structural color, not pigment (a blue jay's feather, crushed, is grey). Blue flowers exist but they're not exactly everywhere. The sky is blue, sure, but it's also the background. You don't name the background.
You name what you can make, what you can trade, what you need to tell apart. The rest is just... there.
I think about Gladstone sometimes, reading the Iliad with his pen, tallying up every color word, slowly realizing something was missing. He thought the Greeks were broken. He was looking at something much stranger: the moment before a color has a name. When the sea isn't blue or green or purple. When it's just the sea, dark as wine, and that's enough.