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1x3x3 Mental Block
Above:Solved
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Looks like 1x3x3 but is built from a 2x2x3.

A shape transformation that defies perception. From the outside it looks like a 1x3x3 or (from another side) like a Mental block. The truth is that this puzzle is made from a 2x2x3. Shape shifting puzzles can often be twisted into strange shapes. But this one leads this property to new extremes.
Some time after the original version Grégoire Pfennig created his own version and named it "Mental Flop". I gave raise to at least two similar named puzzles, also by Grégoire. This version was available through shapeways.

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Contributors

Thank you to the following people for their assistance in helping collect the information on this page: Andreas Nortmann, Lawrence Cuthbert.

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