Rafael Lozano-Hemmer is a Mexican artist. “Tape Recorders” is one of his recent installation which was commissioned by the Museum of Contemporary Art in Sydney.
Rows of motorised measuring tapes record the amount of time that visitors stay in the installation. As a computerised tracking system detects the presence of a person, the closest measuring tape starts to project upwards. When the tape reaches around 3m high it crashes and recoils back.
Each hour, the system prints the total number of minutes spent by the sum of all visitors.