In a wide horizontal format approximately the ratio of 1:2, the wall drawing consisted of a blue field of vertical, horizontal and diagonal lines, giving the strong impression of a loosely woven diamond-shaped pattern. The machine comprised a horizontal top bar from which hung two parallel vertical rods that supported a sled with the writing marker.


— Christian Rattemeyer, Time & Line, Hatje Cantz Verlag, 2012, p. 24.