This one is a Klein Bottle but we just released a cross cap one yesterday: https... | Hacker News

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nervous_jessica on May 2, 2018 | parent | context | favorite | on: A puzzle that tiles infinitely across both sides, ...

This one is a Klein Bottle but we just released a cross cap one yesterday: https://n-e-r-v-o-u-s.com/blog/?p=8068

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