FabLabNBG-Heptagon-Base
thingiverse
This is a regular heptagon, in which all sides and all angles are equal, has internal angles of 128.5714286 degrees. It has a mounting hole, and a pin (called tab here) so that you can fix a statue or similar on it. Why did I choose a heptagon? It is a rare species, and I know the simple construction of length of one side into a given circumcircle done by Albrecht Dürer in 15th Century.
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