Left Brain, Right Brain

I’m not sure I am getting the full effect that "most people" see – when I look
at the image for more than a few seconds I start getting flashbacks to
1973…

This method of presenting stereo images uses animated .gifs to rapidly
switch
between
left and right
images.
For
most
of us the
brain
will impose a crude sense of dimensionality on a wildly wiggling scene.

from
Burningman Opera Ark via BoingBoing