I'm getting a novel optical illusion with the spinning line in the box that shows up near the beginning: Whichever end I'm looking at looks normal, but the other end looks like a split hair, or an open pair of chopsticks. Like what's spinning isn't actually a "/" but actually a very narrow "V" .. only, if I try to look at the split part of the V, that part closes up and the opposite end splits.

Is anyone else getting that?