Exhibit A. [internal dialogue] Well, that just looks stupid. AS IF there's a royal-blue-and-orange raptor. This looks quite a lot like a Peregrine falcon. I wonder if the original picture will be easy to find... [searching] Dum-de-dum-de-dum... Ha! Got it! Next slide, please.
Hidden Images: Optical Illusion Paintings by Oleg Shuplyak – DesignSwan.com
Paintings with optical illusions
Umbelarte: Imagens ambíguas - Gestalt
Do you see it yet?
Optical illusions - Makes my brain feel like it is tilting with windmills. Classical.