cavelamb himself wrote:

If you see this lady turning in clockwise you are
(supposedly) using your right brain.

If you see it the other way, you are (supposedly)
using left brain.

Some people do see both ways, but most people
see it only one way.

If you can see it turning both ways, your IQ is
(supposedly) above 160 -- which is almost a genius.





If you stare at the bottom of the picture and follow the shadows of the
two feet, the shadow of the front foot does not go around the shadow of
the other. By viewing the shadows it gives you a better frame of
reference to see her move back and forth ranther than spinning in one
direction.

John
http://www.sonnyradio.com/spinninglady.html