The popular theory often called the “wine-dark sea” puzzle or the idea that ancient Greeks had no word for blue stems mainly from reading the Iliad and Odyssey, which famously describe the sea as oinops pontos (οἶνοψ πόντος), literally “wine-faced” or “wine-dark sea”, rather than anything like ‘blue sea’. He also uses other surprising color descriptions, like the sky as bronze, and there’s no direct equivalent to our modern blue for the sky or sea in these epics. This idea was popularized in the 19th century by William Gladstone (the British prime minister !) and arose from his own studies of Homer. Gladstone observed that the color vocabulary seemed limited and strange:

Gladstone speculated that this reflected an evolutionary stage in human color perception: ancient people might not have fully seen or distinguished blue as a separate color because their language (and thus their conceptual categories) hadn’t developed it yet. Later popular versions of his idea amplified this into claims that Greeks literally couldn’t perceive blue due to lacking the word for it. This ties into the Berlin and Kay theory from 1969 (hotly contested since inception!), which proposed that languages evolve basic color terms in some sort of predictable order:

1. Black and white (dark/cool vs. light/warm).
2. Red.
3. Green or yellow.
4. The other of green/yellow.
5. Blue (only at a later stage).
6. Brown, then others like purple, pink, orange, gray.

According to this, many ancient languages (including early Greek) were at stages before blue became a distinct basic term. Finer distinctions came only as the culture became more complex.

Mostly a Myth or Oversimplification

While the observation about Homer’s vocabulary is accurate, the stronger claim (that Greeks couldn’t see blue) is widely debunked or heavily qualified today. Here are a few things to consider :

Ancient Greek DID HAVE words that could describe blue-ish shades, especially in later Classical Era. Examples include: Kyaneos (κυάνεος) / dark blue, deep blue, or blue-black (related to lapis lazuli) and Glaukos (γλαυκός) / light blue, grayish-blue, or sea-green (used for Athena’s eyes, often translated gray-eyed).

Greeks could clearly distinguish blue from other colors in art, dyes (they used indigo and other sources), and everyday life. The absence in Homer is more about poetic style, dialect, or cultural priorities (focusing on luminosity or object qualities) than biological inability to perceive blue. Many languages historically lacked a dedicated “blue” term (or split it into light/dark blue), yet speakers saw the color fine. English “blue” itself is relatively recent (c.1300) in its precise sense, for example.

In short, the theory is a mix of real linguistic curiosity (Homer’s odd color use and the late emergence of a blue in many languages) and exaggerated pop-science claims about “not seeing blue.” The Mediterranean sea was blue to them, they just described it poetically as dark and wine-like. If you’re interested in deeper dives, check discussions around Berlin & Kay’s color term evolution or analyses of Homeric epithets.

_{DISCLOSURE : I used Grok to discover the information shared in this post.}