Planet Perplex: Art for the mind

[app103]

Planet Perplex is a comprehensive collection of optical illusions, impossible objects, hidden images, puzzles and related images.

http://www.planetperplex.com

[mouser]

I was gonna post this separately but it seems appropriate to add it here.  Found this massive collection of really well done optical illusions:

http://www.michaelbach.de/ot/

This one in particular blew my mind at how strong it is: http://www.michaelbach.de/ot/mot_mib/index.html

[jgpaiva]

I simply love optical ilusions!!
Here's a fantastic one, taken from the link mentioned by app:
http://www.planetperplex.com/en/img.php?id=295

Also, can you find the dolphins?
http://www.planetperplex.com/en/img.php?id=147

[app103]

For those that are having trouble with the dolphin one, a little help...I enhanced them in red.

Spoiler (click to show/hide)