Beau Lotto: Optical illusions show how we see

I read an article in the New Scientist, I can't remember when. It was basically about a tribe in South America that had many words for the colour green, but when showen a colour palette of reds, could not distinguish between them. they appeared the same because the language was not there. This video looks at how the brain interprets colour, and how things are not always as they seem.