Spinning Silhouette Illusion

The Bad Astronomer had a link to this cool illusion. Interestingly, I have a very hard time seeing her spin clockwise, while the description on the site indicates that it is usually the other way around.

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Planetary Scientist and Asst. Professor of Physics at University of Central Florida; Movie Buff; Trekkie; Jethro Tull fanatic; part-time actor, piano player, writer; and full-time husband and father.

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