The best moments in our lives, are not the passive, receptive, relaxing times—although such experiences can also be enjoyable, if we have worked hard… - Mihaly Csikszentmihalyi

Flow: a state in which people are so involved in an activity that nothing else seems to matter; the experience is so enjoyable that people will continue to do it even at great cost, for the sheer sake of doing it.

Psychologists tend to see creativity exclusively as a mental process [but] creativity is as much a cultural and social as it is a psychological event. Therefore what we call creativity is not the product of single individuals, but of social systems making judgements about individual’s products. Any definition of creativity that aspires to objectivity, and therefore requires an intersubjective dimension, will have to recognise the fact that the audience is as important to its constitution as the individual to whom it is credited.

Optimal experience is thus something that we make happen. For a child, it could be placing with trembling fingers the last block on a tower she has built, higher than any she has built so far; for a swimmer, it could be trying to beat his own record; for a violinist, mastering an intricate musical passage. For each person there are thousands of opportunities, challenges to expand ourselves.