Tian Harlan, architect, engineer, artist develops the communication system 'Chromachron' (Chroma=Color ; Chronos=Time) in 1971. Timekeeping is approximated with a rotating disk revolving around a colored timezone by mechanical (wind-up) movement. Rotation is gauged by motion without demarcation of minutes or seconds. Each color represents an hour and as the cutaway passes through each - time is visualized, as he hoped, with less rigidity. Detailed in Pieter Doensen's book 'Watch - History of the Modern Wristwatch' as the 'anti-stress watch' freeing us from the 'dictatorship of exact time.'
Originally conceived as the 'Colour-Time' clock sculpture at the 1972 Olympic Games in Munich, Tian created over 100 variants of the watch (and clocks) through the eighties.