
The famously ambiguous duck-rabbit image goes back to 19th century Germany (as far as I can tell from 30 seconds of internet research) and probably farther back than that. I first saw it in a cognitive science class and thought it was pretty great.
There's a new children's book out about the duck-rabbit, and I'm a bit disappointed that I didn't think of doing it myself!
Anyway, here's my own duck-rabbit story, drawn on my lunch break today:

Illustration Friday: Adapt