Pretty Math
Klein Bottle Structure
klein bottle children climber 2021-02-07 [2021-02-07 image source
https://twitter.com/kakifur23839165/status/1358224094647357441
]
klein bottle opener
https://www.bathsheba.com/math/klein/
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klein bottle children climber 2021-02-07
[2021-02-07 image source https://twitter.com/kakifur23839165/status/1358224094647357441]
klein bottle opener
https://www.bathsheba.com/math/klein/