Tehching Hsieh (b. 1950)
One Year Performance 1980–1981 (Time Clock Piece)
For one year, from 11 April 1980 through 11 April 1981, Hsieh punched a time clock every hour on the hour. Each time he punched the clock, he took a single picture of himself, which together yield a 6-minute movie. He shaved his head before the piece, so his growing hair reflects the passage of time