I recently found a book on optical illusions, became fascinated and sometimes dizzy, then did some internet research on the subject and found lots of interesting results.
Those that have conversions or big buildings, here's your chance to confuse the eye.
An important note from Mr Kitaoka, one of the artists: Some of the pictures on this website can cause dizziness or possibly epileptic seizures. The latter happens when the brain can't handle the conflicting information from your two eyes. If you start feeling sick when using this website, immediately cover one eye with your hand and then leave the page. Do not close your eyes because that can make the attack worse.
Hope you enjoy them as much as I do. They are absolutely fascinating.
http://www.ritsumei.ac.jp/~akitaoka/index-e.html
http://www.psy.ritsumei.ac.jp/~akitaoka/link-e.html
and here is the search link from google for optical illusions:
http://www.google.com/search?hl=en&q...=Google+Search
If you find an illusion that you really like, please share it here. There are so many of them, I don't have the time to keep looking.
Here is one I find interesting. It appears as though it is moving, but it is really stationary, called "Rotating Snakes".
http://www.ritsumei.ac.jp/~akitaoka/rotate-e.html
Enjoy.