My vision: I think I'd might go crazy because I would think it would be so fucking boring without colours! But besides, if I've never would've seen colours I maybe would've thought differently.. As for a blind person, it maybe would be a schock to see the world for the first time when you're 30 and the world would be so different from what you've imagined it would be - what if the same would be about colours? You've never seen colours and suddenly everything would be in colours - and all what you would imagine about how the world would look like with so much more than just black and white...?