It's probably one of the most basic philosophical questions of childhood; "What if what I see as red is what you see as green, and we just never know?!" Well, childhood and stonerdom. OK, and maybe the rest of us too.
It is, after all, an intriguing proposition that mankind's understand of colour is based on a sort of misunderstanding. This week, Vsauce is tackling the question with characteristic flair. And as always, the realities of the situation are a bit complicated, but it's all the more interesting for it. [Vsauce]