This closed-circuit installation was varied by Dan Graham six times following the same structural set-up as described below:«Two rooms of equal size, connected by an opening at one side, under surveillance by two video cameras positioned at the connecting point between the two rooms. The front inside wall of each features two video screens – within the scope of the surveillance cameras. The monitor which the visitor coming out of the other room spies first shows the live behavior of the people in the respective other room. In both rooms, the second screen shows an image of the behavior of the viewers in the respectively other room – but with an eight second delay.