Stare at this image close up for 60 seconds then lean back and close your eyes. You will see an image of Jesus. This one is freaky.
This is a pretty cool illusion made from wood.
Don't believe it? Try opening up the image in Paint or another image editor and put the 2 tiles side by side.
This T-Rex's head and eyes seem to follow you wherever you go.
Here's an entertaining show put on by 2 guys and a pommel horse.
Another geometry optical illusion. This is an impossible triangle - Part 1.
Girl Illusion - Do You Have a Dirty Mind?
A popular illusion done in a 3D model. Very Cool. Try it yourself.