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Anonymous
>>994429
Because, there is no third-dimension when viewing just the woman. There is no light, no depth, and no color to determine which area is in front of or behind another.
But with the foot shadow, you can CLEARLY see it gets LARGER and moves CLOSER towards the viewer as it exits the left side of the image, then gets SMALLER and moves AWAY from the viewer as it enters on the right.
This creates a 3rd-dimension in the image. An oval on the floor that the shadow traces over. When you visualize this, it's very clear she can only be spinning one way, otherwise, her body and the shadow are rotating opposite of each other.
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