the shape that should not be

https://tekniikanmaailma.fi/matemaatikot-loysivat-platonin-suosikkimuodosta-version-joka-asettuu-aina-samalle-tahkolleen/

THIS TRIANGLE always fall on a certain side

Plato invented the shape in the year 333 Before Christ, in Greece, by drawing it on an Egyptian papyros scroll

mathematicians have been baffled about it for nearly 2500 years