By George Hart for the Museum of Mathematics

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Back in March, this column showed a 3D Hilbert curve made of 64 PVC plumbing elbows arranged in a 4x4x4 cube. Chaim Goodman-Strauss has since outdone himself with an 8x8x8 cube of 512 steel elbows that he made with Eugene Sargent:

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It is springy, but strong enough to stand on, as Chaim demonstrates in this video:

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