 ), and never touch – when walking around the stage, they move in the same direction, while when crossing the stage diagonally, where they would touch in the middle, they avoid the center area (walking around it, always clockwise or always anti-clockwise, depending on the production).In the original production, the play was first performed once, and then, after a pause, an abbreviated version is performed a second time, this time in black and white and without musical accompaniment.These are distinguished as "Quad I" and "Quad II," though "Quad II" does not appear in print.