Turnstile I connected a New York City Subway turnstile in Times Square to an identical turnstile placed in the gallery space. When a person passed through the turnstile in Times Square the arm of the turnstile in the gallery would turn in the appropriate direction.
A sensor installed in the Times Square Subway station determined the speed and direction in which the person was passing through the turnstile. The collected data was sent over the Internet to the turnstile in the gallery where a microcontroller set an electric motor to turn the arm of the turnstile in the corresponding direction.
Turnstile I was shown at the Silverstein Gallery in Soho, NYC in January 1998.
The data stream between the two turnstiles was displayed in real time at Stadiumweb.com.