Optical Illusens

[Asectic]

Not sure whether this is supposed to go in here.
Recently I got this chain mail with all sorts of puzzles. Some worked while others I found it didnt turn out well
Anyways, why do you think our eyes fall for these things? Were they made for this purpose alone?

Thoughts people. Greatly appreciated.

Examples:
http://i240.photobucket.com/albums/f...a/ATT00032.jpg

http://i240.photobucket.com/albums/f...a/ATT00017.jpg

[Sato Arashi]

Nice finds Athna, those are one heck of a find, especially the first one (Which I will not spoil). I think it's how our brain interprets what we see in the picture and the fact that we have to concentrate on a specific object (the dots in this case). With the combination of the concentration at the center and our peripheral vision, various things happens.