Blue is also the color human vision is worst at. You have many fewer blue color receptors than green or red. Images colored blue look more blurry than ones colored green.<p>That said, it&#x27;s still one of the three basic colors humans can see. There was clearly an evolutionary advantage to seeing it. And I find it hard to believe that radiolab episode that said people literally didn&#x27;t see blue, not just use a different word.