Homer’s descriptions of color in The Iliad and The Odyssey, taken literally, paint an almost psychedelic landscape: in addition to the sea, sheep were also the color of wine; honey was green, as were the fear-filled faces of men; and the sky is often described as bronze.
Our brains are pattern-recognizing engines, built around identifying things that are useful to us and discarding the rest of what we perceive as meaningless noise. … This suggests the possibility that not only did Homer lack a word for what we know as “blue”—he might never have perceived the color itself. To him, the sky really was bronze, and the sea really was the same color as wine. And because he lacked the concept “blue”—therefore its perception—to him it was invisible, nonexistent. … Very simply: if we don’t have a word for it, we tend to forget it, or sometimes not perceive it at all.
From Clarkesworld, a sci-fi magazine!