20200301 JAPAN OSAKA PERIODIC STELLATED OCTAHEDRON UNITS

A set of diagrams working through a periodic tessellation of stellated-octahedron (stella octangula) units at different fill fractions, alongside a grid-layout key showing how each unit's triangular faces connect to its neighbours at 60- and 90-degree spacings. The style is consistent with a materials-science or crystallography paper on space-filling polyhedral tilings; the archive filename places it in Osaka, Japan, but this card could not confirm the specific paper, authors or institution.

The card

• Date — 1 March 2020
• Where — Materials-science or crystallography tessellation diagram; Osaka attribution not confirmed. No coordinates are given on the map for this reason.
• Evidence grade — WEB-PHOTO

Works Cited

• Source, Title, Publisher, Year.