# Galvagni Figures for Polyenns

A *polyenn* is a figure made of regular enneagons joined
edge to edge.
A *Galvagni figure* is a figure that can be tiled by a polyform
in more than one way—a kind of self-compatibility figure.
Galvagni figures first appeared in Erich Friedman's
Math Magic
for November 2004.
Here are minimal known Galvagni figures for polyenns.
The black tiles have no Galvagni figures.
The gray tiles have no known Galvagni figures.

### Hypersymmetric

### Hypersymmetric

Back to Galvagni Compatibility
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Polyform Compatibility
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Polyform Curiosities

Col. George Sicherman
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