Adjacent-numbered pages: BP269 BP270 BP271 BP272 BP273  *  BP275 BP276 BP277 BP278 BP279
notso, physics
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Merse E. Gáspár
For a non-physics-based solution, "there exists a never-vertically-increasing path starting from the opening to each point in the interior vs. not so." - Aaron David Fairbanks, Aug 01 2020
Adjacent-numbered pages: BP891 BP892 BP893 BP894 BP895  *  BP897 BP898 BP899 BP900 BP901
nice, handed, updown, physics
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Zane Fry