Optical charm

It is useless to rack a brain that is completely blank. So since "a picture's worth a thousand words," thereby a little visual inspiration won't go astray.

Café Wall Illusion

I always liked this one. There's just something about it. So many more interesting, interacting optical illusions but this seems to...stand out, for me. Its title is rather innocently concocted too. It is a blatantly obvious description of it's origin - the tiles of a café wall! It also formed the conceptual foundation for a piece of architecture in Melbourne in 2006. Rather boxy looking building in my opinion.

Scintillating Grid Illusion, E. Lingelbach, 1994.

This one is just cool. No need to move your head. Or stare for a few seconds - unless you want it to stop. The illusion is instantaneous. And it's not static, to the eye that is.

There are other optical illusions that are awesome but this will do.