It seems we are programmed to alternate between mind-wandering and paying attention, and our minds are designed to wander whether we like it or not. In adapting to a complex world, we need to escape the here and now, and consider possible futures, mull over past mistakes, understand how other people’s minds work. Above all, mind-wandering is the source of creativity, the spark of innovation that leads in the longer run to an increase rather than a decrease in well-being. (Michael Corballis, The Wandering Mind, p. 11)