@moonbolt Similar to how some pictures have two sticky interpretations (rotating dancer, face or two vases, ...), your appearance is very close to different interpretations. Shift involves something tiny changing that changes the interpretation that people have when looking at you (there's no stickyness involved -- that detail is large enough to overcome it). The change is small enough to not/nearly not trigger human motion detection reflex. Thus, people (or at least humans) don't notice the moment of shift, but can always easily tell your state.