American astronomer Clifford Stoll, the man with 1,000 Klein bottles under his house.
https://www.youtube.com/watch?v=-k3mVnRlQLU
More:
https://en.wikipedia.org/wiki/Klein_bottle
Previously:
https://www.homemadetools.net/forum/...3913#post78989
https://www.homemadetools.net/forum/...030#post153256
https://www.homemadetools.net/forum/...112#post125899
