Grace & style. Deriving the greatest amount of benefit from the least amount of effort. Dedication to quality, not flash. That which elevates an action artistically, and
separates a performance from that of a technically
proficient caveman.
Example:
1. Eric Clapton, Slash, and
Joe Satriani have touch. Steve Vai does not.
George Harrison's lack of touch is particularly evident on Revolution, where he sounds like a dying cat.
2.
Jet Li has touch; he always looks like he is moving very slowly, even when he is moving very fast. Jackie Chan cavemans it; he always looks like he is at the the very limit of his ability.
3. Peter Line has touch.
4. Most new rock climbers have no touch, especially muscular guys; they caveman routes and burn themselves out, while the more experience women outclimb them easily.