I was bored at school today so iw as browsing some sites and i cam across these pretty cool optical illusions

check this one out, starre at the 4 black blobs for about 30 seconds then quickly look up at a blank white wall, who do you see?
http://www.coolopticalillusions.com/illusions/jesus.gif

or try this one
stare at the black dot for a while, notice how they outside sort of loses definition?

http://www.coolopticalillusions.com/illusions/dotfadesaway.jpg

or try this

how many legs does this elephant have?
4, 5 or 6?

http://www.coolopticalillusions.com/illusions/elephantlegs.gif