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@aaronpk Easiest way I can think of it is that it's not flipping at all, but rather turning inside out.
@aaronpk Because our eyes are horizontal most of the time? I remember Martin Gardner had a great column about this several decades ago, but I can’t remember the details.
@aaronpk how I try to: they don't flip either, but your mind "rotates the camera" for you along the horizontal plane because that's what it understands.
@aaronpk Have you ever seen this fun explanation? youtu.be/msN87y-iE...