Cornerstone chair block dome. One block builds a dome or arch!
thingiverse
This is known as a 3D chair tile and it is known as an inflationary tile. It can build arches and domes with no mortar or glue. https://www.aperiodictiling.org/wpaperiodictiling/index.php/3d-chair-tiles/ can be used to make an earthship, pizza oven, hut, etc. Aperiodic tile, penrose tiles, asymetric block, 5 fold symmetry, golden ratio, 0.618, 1.618, pyramid, three dimensional, building block.
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