BBC地平线系列：你看到我所见了么

Roses are red, violets are blue but according to the latest understanding these colours are really an illusion. One that you create yourself.
　　Horizon reveals a surprising truth about how we all see the world. You may think a rose is red, the sky is blue and the grass is green, but it now seems that the colours you see may not always be the same as the colours I see. Your age, s...