You should also watch the related video about how he stores Klein bottles under his house. It&#x27;s fascinating.<p><a href="https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=-k3mVnRlQLU" rel="nofollow">https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=-k3mVnRlQLU</a>