Tehching Hsieh
«One Year Performance 1980–1981 (Time Piece)»

For the second One Year Performance, known informally as the «Time Piece,» Hsieh punched a time clock, every hour on the hour, twenty-four hours a day, for an entire year. An observer verified each day's time card. «To help illustrate the time process,» Hsieh shaved his head before the piece began, and then let his hair grow freely for the duration. Every time he punched the clock, a movie camera shot a single frame. The resulting film compresses each day into a second, and the whole year into about six minutes.

(source: Steven Shaviro, «Performing Life: the Work of Tehching Hsieh», http://one-year-performance.com/intro.html)