David Singmaster's Klein Bottle Hat

Woolhelmina's David Singmaster's Klein Bottle Hat

Theano - Hyperbolic crochet hat

HyperHat : Theano pattern by Woolly Thoughts

Florence - Hyperbolic knitted hat

HyperHat : Florence pattern by Woolly Thoughts

Ada - Hyperbolic crochet hat

HyperHat : Ada pattern by Woolly Thoughts

Hypatia - Hyperbolic knitted hat

HyperHat : Hypatia pattern by Woolly Thoughts

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