A 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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