The gymnasium measured 24 × 18 meters. The space was articulated primarily through the use of light. All other elements were reduced to two dimensions, so that the space appeared empty even though there was a “street” represented by a narrow strip of asphalt that entered from the open door and transversed the entire gymnasium. An obstacle on the side of the street was represented by a circle of 60-watt light bulbs attached to a metal base. Another obstacle was a sheet of plexiglass on which was projected a slide showing a window. To the right of the entrance were eighteen red velvet theatre seats with large plates of glass leaning on them to prevent anyone from sitting down. On the floor, perpendicular to the street, were six strips of wood that copied the line of vertical beams that supported the ceiling.