Tiny ants crawl endlessly along a Möbius strip, flipping upside-down once per full loop as the twist carries them around.
A Möbius strip is a surface with only one side and one edge: give a paper strip a half-twist and glue the ends, and a line traced along its middle passes across what looked like both "faces" before returning to its start. That is exactly what each ant demonstrates — walking what feels like a straight path but circling the strip twice (in u) to complete one true loop back to its starting orientation. The twist-count slider lets you add extra half-twists, turning it into a stranger multi-sided band.