The night Jobs died, my ex and I talked about our differing approaches to the worn-out Mac keyboards. She would meticulously get replacement keys, but over the years they came in different varieties of off-white, so her keyboard ended up looking like a weird off-white on off-white checkerboard. And when they stopped making keys the right size she figured out something I still can’t quite follow about putting paper on top of the blurred-out old keys and using a Sharpie to write the letters on them.