How can the 14 proper tridrafters be arranged to form a *galaxy,*
a shape with sixfold rotary symmetry?

These shapes were first tiled by Bob
Harris, who called them the *pinwheel* and the *sawblade.*
The shape on the left has 10 tilings.
The shape on the right has 2.
Patrick Hamlyn has determined that only these two 6-rotary shapes
can be formed by the 14 tridrafters.
Todor Tchervenkov has confirmed my tiling counts.

Last revised 2021-04-11.

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Col. George Sicherman [ HOME | MAIL ]