The time you spend is not your own. You are, as a class of human beings, responsible for more pure raw time, broken into more units, than almost anyone else. You spent two years learning, focusing, exploring, but that was your time; now you are about to spend whole decades, whole centuries, of cumulative moments, of other people’s time. People using your systems, playing with your toys, fiddling with your abstractions. And I want you to ask yourself when you make things, when you prototype interactions, am I thinking about my own clock, or the user’s? Am I going to help someone make order in his or her life, or am I going to send that person to a commune in Vermont?

Paul Ford, “10 Timeframes”