Disks with 20-fold-symmetric rotational interactions spontaneously self-assemble into a network equivalent to a rhombus tiling by engaging only 4 of their bonds.

From the article:

Emergent Rhombus Tilings from Molecular Interactions with $M$-fold Rotational Symmetry
Stephen Whitelam, Isaac Tamblyn, Juan P. Garrahan, and Peter H. Beton
Phys. Rev. Lett. 114, 115702 (2015)

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