Going For The Flow

"[A psychologist's] famous work on 'flow' describes a state in which a person is so totally involved in a task that time slows down, enjoyment is heightened, and the task seems almost effortless. This 'high' is achieved when the challenge just matches the person's skills; if it's too easy the experience is boring, too hard and it's frustrating. As people master tasks, they must seek greater challenges and match them with higher-level skills in order to keep experiencing flow." - Geoff Colvin