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A 3x3x3 truncated on 4 edges and afterwards extended. The result looks like a pyramid with a square base.
This puzzle is part of the series "Sharp Edges". All modifications of this series are made by truncating an 3x3x3 on its edges. These truncations are not symmetrically as in the octagon regularly. One dimension of the cut goes deeper than the other. The best example to view the cutting depths is "Idiots Windmill" which is in the museum too. Some members of this series are made solely by truncating. Others receive additional extensions to "delete" some of the remaining faces.
The technical signature (AA000) indicates where to cut the original cube.
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