But why "wine-dark" and not deep blue or green? In 1858 a scholar named William Gladstone, who later became the prime minister of Great Britain, noticed that this wasn't the only strange color description.
Though the poet spends page after page describing the intricate details of clothing, armor, weaponry, facial features, animals, and more, his references to color are strange. Iron and sheep are violet; honey is green. So Gladstone decided to count the color references in the book.
And while black is mentioned almost 200 times and white about 100, other colors are rare. Red is mentioned fewer than 15 times, and yellow and green fewer than 10. Gladstone started looking at other ancient Greek texts and noticed the same thing — there was never anything described as "blue."
The word didn't even exist. It seemed the Greeks lived in a murky and muddy world, devoid of color, mostly black and white and metallic, with occasional flashes of red or yellow. Gladstone thought this was perhaps something unique to the Greeks, but a philologist named Lazarus Geiger followed up on his work and noticed this was true across cultures.
He studied Icelandic sagas, the Koran, ancient Chinese stories, and an ancient Hebrew version of the Bible. Of Hindu Vedic hymns, he wrote: "These hymns, of more than ten thousand lines, are brimming with descriptions of the heavens.
Scarcely any subject is evoked more frequently. The sun and reddening dawn's play of color, day and night, cloud and lightning, the air and ether, all these are unfolded before us, again and again ... but there is one thing no one would ever learn from these ancient songs ... and that is that the sky is blue."
There was no blue, not in the way that we know the color — it wasn't distinguished from green or darker shades. Geiger looked to see when "blue" started to appear in languages and found an odd pattern all over the world. Every language first had a word for black and for white, or dark and light.
The next word for a color to come into existence — in every language studied around the world — was red, the color of blood and wine. After red, historically, yellow appears, and later, green (though in a couple of languages, yellow and green switch places). The last of these colors to appear in every language is blue.
The only ancient culture to develop a word for blue was the Egyptians — and as it happens, they were also the only culture that had a way to produce a blue dye. If you think about it, blue doesn't appear much in nature — there are almost no blue animals, blue eyes are rare, and blue flowers are mostly human creations.
There is, of course, the sky, but is that really blue? As we've seen from Geiger's work, even scriptures that contemplate the heavens continuously still do not necessarily see it as "blue."
In fact, one researcher that Radiolab spoke with — Guy Deutscher, author of "Through the Language Glass: Why the World Looks Different in Other Languages," tried a casual experiment with that. In theory, one of children's first questions is, "Why is the sky blue?" So he raised his daughter while being careful to never describe the color of the sky to her, and then one day asked her what color she saw when she looked up. Alma, Deutscher's daughter, had no idea.
The sky was colorless. Eventually she decided it was white, and later on, eventually blue. So blue was not the first thing she saw or gravitated toward, though it is where she settled in the end.
So before we had a word for it, did people not naturally see blue?
This part gets a little complicated, because we do not know exactly what was going through Homer's brain when he described the wine-dark sea and the violet sheep — but we do know that ancient Greeks and others in the ancient world had the same biology and therefore same capability to see color that we do.
But do you really see something if you don't have a word for it?
A researcher named Jules Davidoff traveled to Namibia to investigate this, where he conducted an experiment with the Himba tribe, which speaks a language that has no word for blue or distinction between blue and green.
When shown a circle with 11 green squares and one blue, they could not pick out which one was different from the others — or those who could see a difference took much longer and made more mistakes than would make sense to us, who can clearly spot the blue square. But the Himba have more words for types of green than we do in English.
Davidoff says that without a word for a color, without a way of identifying it as different, it is much harder for us to notice what is unique about it — even though our eyes are physically seeing the blocks it in the same way. So before blue became a common concept, maybe humans saw it.
But it seems they did not know they were seeing it. If you see something yet can't see it, does it exist?
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