The father of focus was Mihaly Csikszentmihalyi an American Hungarian psychiatrist who associated focus with happiness. His contention was that true happiness comes from doing things in flow. Flow was designed as something that had enough challenge that makes it exciting while at the same time not being boring. For example, passive activities such as TV watching are considered that takes low skills and low challenges.
Focus tends to compact time so that the involvement takes the focuser from beginning to end without them realizing it. The concentration is absolute.
