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=== In orthogonal projection === An object illuminated by parallel rays of light casts a shadow on a plane perpendicular to those rays, called an [[Orthographic projection|orthogonal projection]]. A polyhedron is considered ''equiprojective'' if, for some position of the light, its orthogonal projection is a regular polygon. The cube is equiprojective because, if the light is parallel to one of the four lines joining a vertex to the opposite vertex, its projection is a [[regular hexagon]].{{r|hhlnqr}}
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