While researching an upcoming presentation, I returned to the subject of "natural mapping" in buttons and other user interfaces. I was first introduced to it by Don Norman's "The Design of Everyday Things," which contains the classic example of mapping knobs to burners on a stove: a row of four knobs doesn't map to a 2x2 square of four burners, but a similar 2x2 square of knobs is immediately obvious. Anyway, I found this image of a wonderfully naturally-mapped control for powered adjustable car seats. Move the little seat parts any way you like, and the real seat follows. It's simple, obvious, and intuitive - and makes for some very pressable buttons!