## Stewart toroidA polygon with a hole through it that meets some or all of the criteria specified by Bonnie Madison Stewart in his 1980 book Adventures Among the Toroids. These criteria are as follows:
all faces must be regular; faces that meet mustn't lie in the same plane;
the polygon must be quasi-convex; the hole through the polygon must change
its genus; and, the faces aren't allowed to
intersect with themselves or each other. Stewart toroids, pierced relatives
of the familiar Platonic solid, combine
dazzling complexity with attractive symmetry. ## Related category• SOLIDS AND SURFACES | |||||

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