Polaroid Cube was suggested by Landon Kryger. It is a hollow spherical 2x2x2 Rubik's Cube. However, instead of stickers, it uses polarizing filter. The object is to turn the puzzle and make all three directions opaque.
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Twisty Puzzles ForumPlease contact Oskar directly if you are interested in obtaining a fully colored, stickered (uh, polaroided) and assembled sample of this puzzle.