Illusion Cube

Firmly, a clear cube with a checker pattern that seems to bend as the eye travels.

This crystal illusion cube is contemporary. Crystal is a clear, colorless quartz or glass that is cut and polished to refract light, and cut forms are often meant for display on a desk or shelf. Held in frame, a solid transparent block, its top and base covered in black and white checks that warp across the surface. The sides show a mirrored reflection of the pattern, and the edges are clean and sharp. It is 4 inches wide, 4 deep and 4 high.

A cube of flat checks that insists on being three-dimensional.