I think I am losing my mind.
A few years ago, I was reading yet another popular science book—I think it was Brian Greene’s The Elegant Universe—when I came across a reference to one of those barroom brain teasers. It goes like this: if your image in a mirror is reversed with regard to right/left and left/right, why is not also reversed from up/down and down/up?
The answer, while elementary, is surprisingly difficult to articulate. It helps to imagine yourself, not face-to-face with your reflection, but back-to-back, with the plane of the mirror between you and your mirror-doppelgänger. Now stick your arms out and waggle your fingers. For both you and your reflection, up is still up, and down is still down. This side (left to you, right to your doppelgänger) is still this side, and that side (right) is still that side.
The only real difference is that up/down has an objective definition; that is, which direction is the earth and which the sky. But left/right has a purely subjective definition, relative to whose set of eyes one is looking through.
Simple, right?
Continue reading “The Metaphysics of Left and Right (No, Not Politics; the Freakin Directions!)”