3D-Shadows
Shadows gain depth.
Illuminated with red and green light, a tetrahedron casts a red and a green shadow on the screen. Viewed through glasses with red and green filters, each eye receives two slightly offset shadow images of the same object. The brain constructs three-dimensional shapes from this information.
Shadows of people standing on the yellow surface also gain depth. This becomes especially noticeable with an outstretched arm (Superman!). Why not try shaking hands with yourself?
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