cover your right eye and look at the line drawn one on the lhs and then you'll realise that you can't see the lhs one.....as you move your head closer......it took me a couple of min as i'm stoned......Peace out.......Sid
I saw one of those in a book once....they're pretty cool. I forget exactly, but doesn't your eye compensate for it by just blending the colors it sees around the blind spot? I think that's why we never notice it normally.