The opposite of play isn't work it's depression. ---- Brian Sutton-Smith, a leading psychologist of play, once said, “The opposite of play isn’t work. It’s depression.” When we’re depressed, according to the clinical definition, we suffer from two things: a pessimistic sense of inadequacy and a despondent lack of activity. If we were to reverse these two traits, we’d get something like this: an optimistic sense of our own capabilities and an invigorating rush of activity. There’s no clinical psychological term that describes this positive condition. But it’s a perfect description of the emotional state of gameplay. - Jane McGonigal in [[Reality is Broken]]