Möbius strip

noun2

1. •
   A one-sided surface formed by identifying two opposite edges of a square in opposite senses;

   • Like a mind moving on a Möbius strip of events, one's consciousness goes over the same territory again and again without ever becoming aware of the nature of awareness. — 1981
2. •
   a narrow strip given a half twist and joined at the ends, forming a three-dimensional embedding of said surface.