Here we have a Möbius strip, a form with one face, and one edge. It has no upper or lower faces, or inner and outer edges. The design comprises a single band of mauve, a single band of green, and a single band of orange. Trace around with your finger if you don’t believe me!
Technically, this was very challenging, trying to juggle different stitch directions and ways of joining corners, not to mention just keeping it flat!