Flow

"Flow denotes the holistic sensation present when we act with total involvement. It is the kind of feeling after which one nostalgically says: 'that was fun,' or 'that was enjoyable.'"
- Mihaly Csikszentmihalyi
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Techne

"Techne - an 'art,' 'craft,' 'skill,' 'expertese,' 'profession,' or even sometime translated, a 'science' - a thorough, masterful knowledge of a specific field that typically issues-in a useful result, can be taught to others, and can be recognized, certified, and rewarded." 
- David Roochnik