Beach Footprint Optical Illusion

Beach Footprint Optical Illusion is simple yet still a neat effect. When you look into the footprint in the sand does it appear convex or concave? If you stare at it for a minute or two it almost appears to switch back and forth? Any ideas which one is the real one.  Take a close look and let me know what your think.

Convex or Concave footprints in the sand.


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