A Möbius strip is a one-sided surface. We're accustomed to seeing them in our 3 dimensions as a long strip, with a single half-twist, joined at the ends. This is the 3-dimensional projection, represented in 2, of such a strip in 8 spatial dimensions
(Mathematicians: take as many potshots as you will - 'tis a mere flight of fancy!)
I like this Ian.