hepsilon-delta
@hepsilon-delta.bsky.social
Spouse and parent. Mathematics at University of Aberdeen. Algebraic topology, homological stability, magnitude homology. Collector of houseplants, yo-yos, hobbies.
Getting mathematical: there are examples matching tetrahedron, cube, octahedron and dodecahedron, but not the icosahedron. But the first ball here shows that the makers are close to being able to “dualise”, so it’s plausible to me that they may have known the icosahedron-type arrangement.
December 10, 2024 at 11:46 AM
Getting mathematical: there are examples matching tetrahedron, cube, octahedron and dodecahedron, but not the icosahedron. But the first ball here shows that the makers are close to being able to “dualise”, so it’s plausible to me that they may have known the icosahedron-type arrangement.
The large discs on the ball in the first image match the faces of a cube; the knobs on the ball in the second image might match those of a dodecahedron.
December 10, 2024 at 11:43 AM
The large discs on the ball in the first image match the faces of a cube; the knobs on the ball in the second image might match those of a dodecahedron.
Carved stone balls are uniquely Scottish artefacts from the late Neolithic (3000-2500 BCE). The decorations, often raised or inscribed knobs or discs, are in some cases configured in the same way as faces or vertices of polyhedra.
December 10, 2024 at 11:42 AM
Carved stone balls are uniquely Scottish artefacts from the late Neolithic (3000-2500 BCE). The decorations, often raised or inscribed knobs or discs, are in some cases configured in the same way as faces or vertices of polyhedra.