When was the last time you lost yourself in a task? One moment you had just sat down, and the next, hours had flown by, barely noticed.
Whatever it was that you were engaged in - cooking a complicated meal, or focusing on an absorbing creative task such as drawing or writing - you will have been in that sweet spot where the challenge you were faced with was being met with the best of your abilities and imagination.
The right sort of work can help to nurture and feed your sense of calm, because you are engaged in something challenging that you are good at, you enter a state that psychologists call 'flow'.
It is the antithesis of multitasking. Mihaly Csikszentmihalyi, one of the founding figures of positive psychology, has studied flow as feeling 'strong, alert, in effortless control, unselfconscious and at the peak of (your) abilities'.