One Year Performance 1980-1981 (Time Clock Piece) 

For one year, from 11 April 1980 through 11 April 1981, Tehching Hsieh punched a time clock every hour on the hour. Each time he punched the clock, he took a single picture of himself with a 16mm movie camera, which together yield a 6-minute film animation.

 

He shaved his head before the piece, so his growing hair reflects the passage of time.