The hollow face illusion is pretty trippy. It is when a concave mask appears as a normal convex. The hollow face can also follow a moving viewer. This Einstein Hollow Face Illusion Paperweight lets you experience this optical illusion at your place.
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Albert Einstein Hollow Mask Illusion Optical Toy
As you move left or right, Einstein’s face will follow you. This acrylic paperweight looks even better with a light under it.
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