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For example, the square cupola is a Johnson solid (J4). A square is a
*4/1*-gon, so the cupola's base is an *8/1*-gon, ie an octagon.

The model presented here is a *4/3* cupola. A *4/3*-gon is a
*retrograde* square, ie a normal square, but we visit the four vertices in
the opposite order. So the base is an *8/3*-gon, which is an octagram, as
you can see in the picture.

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