Why do we make a hand-crank motion when asking someone to roll down their window? After all, in most new cars, that’s done with the press of a button. An outmoded gesture like this is similar to a skeuomorph, a design element that still used even though it no longer has a function. For example, smartphones still use images of old handsets or tape recorders to indicate phone and voicemail functions. This is part of a complete episode.