[Item=Empty Klein Bottle] and its variants exist. I'm interested in a Möbius strip, which can be constrcuted. For Miss Sinister's treasure.

like this one?

Thank you, for telling me. New goal, 80 Megs worth.

glad i could help!! unfortunately it's a january collection item but while the collection isn't as cheap as the cash shop price, it's at least cheaper than the book :p

It'll be worth waiting for or earning towards.