The names we use to describe personality traits - such as extrovert, high achiever, or paranoid - refer to the specific patterns people have used to structure their attantion. At the same party, the extrovert will seek out and enjoy interactions with others, the high achiever will look for useful business conacts, and the paranoid will be on guard for signs of danger he must avoid. Attention can be invested in innumerable ways, ways that can make life eihther rich or miserable.

ISBN 0-06-092192-7
Csikszentmihalyi Mihaly (1996). Optimal Experience: Psychological studies of flow in consciousness Cambridge: Cambridge University Press. "
To achieve a flow state a balance must be struck between the challenge of the task and the skill of the performer.

He is noted for his work in the study of happiness and creativity but is best known as the architect of the notion of flow and for his years of research and writing on the topic. iː/ MEE-hy CHEEK-sent-mə-HY-ee; Hungarian: Csíkszentmihályi Mihály [ˈtʃiːksɛntmihaːji ˈmihaːj]; born September 29 1934 in Fiume Italy – now Rijeka Croatia) is a Hungarian psychology professor who emigrated to the United States at the age of 22. Martin Seligman former president of the American Psychological Association described Csikszentmihalyi as the world's leading researcher on positive psychology.