Do you suppose zebras get dizzy when they watch each other run? Especially when they are travelling in a herd? I'm pretty sure I would get all woozy if I found myself in the midst of a scrum of undulating bar codes.
But maybe zebras are immune to their own stripiness. Sort of the way snakes are immune to their own venum. And yet we can detect our own asparagus pee. Hmmm.