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Fifth Chair Puzzle — image 1
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Fifth Chair Puzzle

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Use these 4 similar figures to form a fifth one!

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Use these 4 similar figures to form a fifth one!

A classic puzzle based on Delian Bricks (cuboids of proportions 1 : ∛2 : ∛2²). More info here.

It is safe to re-scale the whole STL file using the same scale in the X, Y and Z dimensions, but I've also attached the parametric OpenScad file that includes the solution.

Inspired by https://www.thinkfun.com/products/the-fifth-chair/

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