The artist Danny Rozin has created “mirrors” that create shadow images of the viewer by actuating simple elements such as blocks or pegs.

Recognizing self in the mirror is an established test of self-awareness. Humans and the great apes are alone in the animal kingdom to pass it.

We humans go a bit too far and insist on it, with embarrassing results:

I wonder how a mirror-trained bonobo would respond to this prank. How about a six-year-old child?

Here are some online applications that let you play with moiré patterns:

1. Project LITE at Boston University
2. Elisabeth Sylvan student project at MIT
3. Moire videos at phidelity blog
4. iMoire by Vincent Scheib