Once upon a time, an artist in a tiny town of 28 people looked at the gaps between spheres and found the universe hiding inside them. Two gaps — one bigger, one smaller — and from just those two shapes, everything follows: why electrons have the mass they do, why light bends the way it does, why the universe exists at all. Volume 18 is the BCT Superfluid Lattice Model for young readers. It explains sphere packing, void geometry, and zero free parameters in gentle, illustrated language. The same mathematics that gives physicists the fine structure constant gives children a way to see the universe as a crystal — beautiful, precise, and full of gaps that turn out to be everything. Three inputs. Zero free parameters. One geometry. For everyone.
Michel Robert Michel (Wed,) studied this question.