Hermits Rock

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Around and around and around she goes

Via Mind Hacks, this spinning silhouette can appear to spin both clockwise and counterclockwise. The advice to concentrate on the shadow, right where the foot comes near contact with the reflection (that is, where the illusion of perspective is most flattened), helps. Though I sometimes get stuck seeing it spin in one direction occasionally, I can pretty much switch it back and forth at will now.

PS. Were erect nipples really necessary?