But who ever thought about tags? Catching the ball, slapping down the tag -- sure, everyone knows that it takes skill. But until Baez, it was presumed that there were limits to that skill, like there are limits to, say, stepping on and off a moving sidewalk at the airport or backing your car into a parking space. Some people are unquestionably better than others, but there seems a point where the possibilities top out, where there's no place left to go.
Nobody thought that tagging someone could be an actual art form.