If this thema already has, forgive me, then please merge the thread posts, otherwise i start with this: (only found, but found interesting)
http://cdn.fotocommunity.com/photos/619609.jpg
Ok, many here, feel free to take out and comment:
http://images.google.de/images?sourc...ture+illusions
This is particulary dangerous:
http://farm3.static.flickr.com/2234/...61774699_o.jpg
I like particular the surreal ones, like this:
http://lookintomyowl.com/images/davi...trict-2008.jpg