Description
German: Tetraeder in Bottrop, officially Haldenereignis Emscherblick, walkable steel structure in the form of a tetrahedron with a side length of 60m (Sierpinski tetrix)
German: Tetraeder in Bottrop, officially Haldenereignis Emscherblick, walkable steel structure in the form of a tetrahedron with a side length of 60m (Sierpinski tetrix)
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