Cube-in-a-Sphere Illusion
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A cube is inside a sphere and a sphere is inside a cube. The sphere in the cube seems to be larger even if the two spheres are equal. Move the two figures together and vary the plot range to see that the spheres are equal.
Contributed by: Sándor Kabai (June 2008)
Open content licensed under CC BY-NC-SA
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"Cube-in-a-Sphere Illusion"
http://demonstrations.wolfram.com/CubeInASphereIllusion/
Wolfram Demonstrations Project
Published: June 26 2008