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From one corner it looks like a 2x2x2 but has only 7 cubies of which only one can be moved at a time. While being moved every cubie is rotated in a distinct way.
This puzzle is based on an idea by Alex Polonsky who showed Oskar a new design with seven cubes tumbling in an unusual fashion inside an exoskeleton. Mr. Polonsky gave Oskar the permission to reuse the movement, but came up with a different design using an endoskeleton.
The result is a 3D sliding puzzle where seven cubes turn around a sphere. Because of the cube reorientations similar to Bram's Black Hole, the puzzle was named Alex Black Hole. The mechanism is similar to PantaCube.
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Thank you to the following people for their assistance in helping collect the information on this page: Andreas Nortmann, Brandon Enright, Jack Lieberman.
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