I admit that this is very new to me. Thanks to M.C. Escher (one of my favorite artists), I knew what a Mobius strip was, but I had never heard of a Klein bottle before Skyler and his family gave me one for my unbirthday a few weeks ago.
The Klein bottle they bought for me was sent in a typical cardboard box, and the sender had added some interesting artwork and notices on the outside of the box. They also included some interesting documentation with the Klein bottle. All in all, it is very entertaining and informative!
And here are the documents that were included:
