Note: Smallest known universal cover. It isn't proved optimal (and probably isn't). Also, the title here is a little confusing as this has nothing to do with

Note: Smallest known universal cover. It isn't proved optimal (and probably isn't). Also, the title here is a little confusing as this has nothing to do with universal covers in the usual (topological) sense; this is about Lebesgue's universal covering problem[0], a problem in plane geometry. [0]https://en.wikipedia.org/wiki/Lebesgue%27s_universal_covering_problem https://en.wikipedia.org/wiki/Lebesgue%27s_universal_coverin...