The aluminium tube holds a pen. A circle of paper is attached to the turntable with magnets. The pen draws on the paper as the arms and turntable rotate. The pink and orange dials control the rotational speed of the pink and orange arms respectively. The white dial controls the rotational speed of the tuntable. The dials also control the direction that the arms and turntable rotate - either clockwise or anticlockwise. In between the fastest and slowest speeds there is an infinite range, so the relative speeds can produce a huge variety of patterns - most of them seem to be chaotic. By changing the pen and the speeds one pattern can be drawn on top of another.