1 hour strike class. 3 at 8:00, random incline to 1.5% .5 at 6:00, -3% decline. .5 at 5:20, -3% decline. Modification of image posed last week, if you concentrate on the black center the dots will appear yellow then disappear altogether: 
Now, the image of the woman below is not objectively “spinning” in one direction or the other. It is a two-dimensional image that is simply shifting back and forth. But our brains did not evolve to interpret two-dimensional representations of the world but the actual three-dimensional world. So our visual processing assumes we are looking at a 3-D image and is uses clues to interpret it as such. Or, without adequate clues it may just arbitrarily decide a best fit – spinning clockwise or counterclockwise. And once this fit is chosen, the illusion is complete – we see a 3-D spinning image.
By looking around the image, focusing on the shadow or some other part, you may force your visual system to reconstruct the image and it may choose the opposite direction, and suddenly the image will spin in the opposite direction. 
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