Ergonomics is about designing for failure modes and extremes: how things break under repetition, stress or other limits. And the goal of ergonomic designis to create an alignment between the user's limits, the thing you're designing, and how people will ideally use that thing.

Apple excels at taking existing concepts - computers, MP3 players, conceit - and carefully streamlining them into glistening ergonomic chunks of concentrated aspiration.