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In the theory of tessellations, the Conway criterion specifies a sufficient rule for a prototile to tile the plane. This Demonstration shows a construction of tiling using the Conway criterion. Two Bézier curves of a polygon are parallel and two are centrally symmetric, both satisfying the Conway condition. You can drag the red locators in the prototile mode.
Contributed by: Izidor Hafner (May 8)
Open content licensed under CC BY-NC-SA
 Wikipedia. "Conway Criterion." (Apr 14, 2023) en.wikipedia.org/wiki/Conway_criterion.
 D. Schattschneider, "Will It Tile? Try the Conway Criterion!," Mathematics Magazine, 53(4), 1980 pp. 224–233. doi:10.1080/0025570X.1980.11976859.
 D. Schattschneider. Two Conway Geometric Gems [Video]. (Apr 14, 2023) www.youtube.com/watch?v=VUatbM2sxh8&t=1s.