Called ‘the hat’, the 13-sided shape can be arranged in a tile formation such that it never forms a repeating grid
An Aperiodic Monotile - Grasshopper - McNeel Forum
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The miracle that disrupts order': mathematicians invent new 'einstein' shape, Mathematics
An Aperiodic Monotile - Grasshopper - McNeel Forum
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Newly discovered 'einstein' tile is a 13-sided shape that solves a decades-old math problem