Mihaly Csikszentmihalyi on flow
ted.com
ted.com
The most useful slide of the entire presentation is also on the man's Wikipedia page: http://en.wikipedia.org/wiki/File:Challenge_vs_skill.jpg I think I'll need to stare at it for a while longer and think about how those emotional states relate and how I might artificially jump from one to the next.
http://www.amazon.com/Flow-Psychology-Experience-Mihaly-Csik...