Illusion

[firstfrost]

This is the coolest optical illusion I've seen yet:

http://www.patmedia.net/marklevinson/cool/cool_illusion.html

Comments

[chenoameg.livejournal.com]

Not only do they have no edges, but I'm pretty sure the background grey was carefully chosen to appear the same to our non-color vision. I bet that helps them disappear.

(Hmm, what a neat form of secret message, something that you could only see after you let the pink dots disappear...)