Most people can see this optical illusion move and shift when they look at it for a short while.
Explanation
Since we live in a three dimensional world, our mind tries to convert a two dimensional object into a 3D object. In this optical illusion, we try to make sense of these 2D objects. The shading used in is completely incongruous. We lock onto a bit of the illustration that looks appropriately shaded but then find it disjointed with shading in other nearby areas. We keep jumping around the drawing to try to map out a 3D solution that would make the shading illustration make sense, but it never seems to work.
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