P-18 (random walk)

This plotter drawing was created using a computer program written by the artist. A plotter is a mechanical device that holds a pen or brush and is linked to a computer that controls its movements. Plotters were one of the few available output devices for computers in the late 1960s. Mohr began using computers in his art in 1968, and this is one of his earliest plotter drawings. The 'P-18' of the title refers to the particular computer program used to generate this drawing. From one program Mohr could produce a series of drawings. The V&A holds two other drawings also created from this same program (see V&A museum numbers E.96-2008 and E.200-2008).

In 1969, access to computers was difficult owing to their size and cost. Mohr applied to the Paris Institut Météorologique for permission to use their computer and plotter. It is likely that he created this drawing whilst at the Institute.