drosteeffect

The Droste effect is when a photo recursively appears within itself -- the photo within the photo within the photo, "tunneling" forever. Here's a 12-minute video by photographer and retoucher Antti Karppinen that shows you can create a Droste effect photo for yourself.

Whoa... We've all seen the so-called "Droste effect" in action—an image that contains itself, so it becomes a photo, in a photo, in a photo, etc. But now you get to look out from inside one! Turns out, it's just as trippy as it sounds.