"You may have thought, the last time you blew off work on a presentation to watch “How I Met Your Mother,” that you were just slacking. But from another angle you were actually engaging in a practice that illuminates the fluidity of human identity and the complicated relationship human beings have to time. Indeed, one essay, by the economist George Ainslie, a central figure in the study of procrastination, argues that dragging our heels is “as fundamental as the shape of time and could well be called the basic impulse."