D20 inside a D20 dice – Maths Gear - Mathematical curiosities

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Scientists Learned How to Design Dice to Roll Any Way You Want

Most 20-sided dice have the decency to arrange the numbers so that opposite faces always add to 21. But they do not make sure the numbers are evenly

Numerically Balanced D20

Unique polyhedral dice – Maths Gear - Mathematical curiosities

Most 20-sided dice have the decency to arrange the numbers so that opposite faces always add to 21. But they do not make sure the numbers are evenly

Numerically Balanced D20

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Intransitive dice - Wikipedia

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Everyone Needs A Shed