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This is a shadow of a 4 dimensional D24 Die. The shape is called a hyper cube. It is made up of 8 equally sized cubes with each face of each cube connected to a face of another cube. Since it is a shadow and not actually printed on a 4 dimensional printer there is some warping of geometry and a bit of thought is needed to see the 4 dimensional shape. The sides have been numbered keeping to the rule that opposite sides must add to 25 and arranged and weighted so it can still be used as a fair 3D D6.