Perplexing Pyramid puzzle: rule sheet 
Len Gordon's Perplexing Pyramid has only one solution, though two pieces can be switched symmetrically. We then worked out many other simple figures to build with the six pieces, including twodimensional shapes and some mutant almostpyramids, as illustrated below. What makes this puzzle so tricky is that the pieces have square angles while the pyramid shape appears to need triangles. 

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