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Seven-sided, a heptagon has no history in art; it isn't a triangle, square, rectangle, pentagon, octagon, parallelogram, or circle, all of which carry some meaning, and many of which Palermo used.
At the same time, one can imagine that Knoebel began with a heptagon because many religions believe seven is an occult number.
The heptagon is better for travel, so I figure I'll get it for my trip this summer, and then give away the strip-styled one to the first person who mentions going onto a medicine long-term.— gordsellar.com
We are still working on the infra band, over across on the Second's board, but we won't last long As he spoke, the mighty fabric lurched under them, and only their quick and powerful tails, darting in lightning loops about the bars, saved them from being battered to death against the walls as the heptagon was hurled end over end by a stupendous force.— Spacehounds of IPC
Flashing a minute pencil behind the huge heptagon, Brandon manipulated his tuning circuits until a brilliant spot in space showed him that he was approaching resonance with the heptagon's power beam.— Spacehounds of IPC

American Heritage Dictionary (1)
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