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Two 2x2x2s (both hollow) in one puzzle. One was designed around the other.
Nested Cube is a Hollow-Cube-style puzzle with a hollow spherical 2x2x2 turning inside a hollow 2x2x2. At two places, a corner of the inner 2x2x2 is connected to a corner of the outer 2x2x2. So some sides of the inner 2x2x2 can turn independently of the outer 2x2x2, but other not. Oskar would call this "inside-out bandaging".
The concept of inside-out bandaging was independently developed by Katsuhiko Okamoto as well. Okamoto built an octahedrally-modded cubic 3x3x3 inside his famous Void Cube. He connected three inner edges to three outer edges, while the other edges turn independently. The result is Okamoto's "Kepler Cube".
Thank you to the following people for their assistance in helping collect the information on this page: Andreas Nortmann, Brandon Enright.
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