[torben-friis]

> Surely when you look at grass and the sky you feel you need different terms to describe them?

That probably depends on how frequently do you need to describe something as "sky-colored" vs "grass-colored". I can't really think of many things in nature that are blue (some people's eyes, the occasional flower or gemstone) so if you don't need that word to describe anything else you might just leave it at "the sky is a weird shade of green" rather than having a color that only describes one thing in the universe.

[myself248]

This is interesting, because I've latched onto a particular color of masking tape for labeling. It's a light green, a color shared by very few other objects in the indoor environment.

https://www.paintersmategreen.com/

It stands out against cardboard and all the variously-colored plastic boxes I own, and it's light enough to offer great contrast with a black Sharpie on it.

So for me, that color is useful specifically because it's relatively unique.