Scientific American After the disaster of 2020, let’s hope we’re not on a figurative one Advertisement If you were to trace both “sides” of a Möbius strip, you would never have to lift your finger. A single-sided surface with no boundaries, the strip is an artist’s reverie and a mathematician’s feat. A typical thought experiment to demonstrate how the three-dimensional strip operates involves imagining an ant on an adventure. Picture the insect traversing the Möbius band. One apparent loop would land the ant not where it started but upside down, only halfway through a full circu...