On a Roll part 2

From 'Thinking, fast and slow' by Daniel Kahnemans this snippet from a quite brilliant book follows the current Skreeworld research in to being on a roll.
For most of us, most of the time, the maintenance of a coherent train of thought and the occasional engagement in effort full thinking also require self control. Although I have not conducted a systematic survey, I suspect that frequent switching of tasks and speeded up mental work are not intrinsically pleasurable, and that people avoid them when possible. This is how the law of least effort comes to be a law. Even in the absence of time pressure, maintaining a coherent train of thought requires discipline. An observer of the amount of times I look at e mail or investigate the refrigerateor in an hour of writing could reasonably infer an urge to escape and conclude that keeping it requires more self control than I can readily muster.
Fortunately,cognitive is not always aversive, and people sometimes expend considerable effort for long periods of time without having to exert willpower. The psychologist Mihaly Csikszentmihalyi has done more than anyone to study this state of effortless attending, and the name he proposed for it, flow, has become part of the language. People who experience flow describe it as 'a state of effortless concentration so deep that they lose their sense of time, of themselves, of their problems' and their descriptions of the joy of that state are so compelling that Csikszentmihalyi has called it an 'optimum experience' . Many activities can induce a sense of flow, from painting to racing motorcycles and for some fortunate authors I know, even writing a book is often an optimum experience. Flow neatly separates 5the two forms of effort, concentration on the task and the deliberate control of attention. Riding a motorcycle at 150 miles an hour and playing a competitive game of chess are certain,y effort full. In a state of flow, however, maintaining focused attention on these absorbing activities requires no exertion of self. On troll, thereby freeing resources to be directed to the task in hand.'
It goes without saying my working life has been in pursuit of and maintaining this state for as long as possible.