Sometimes these plans derived from a logical system, like a game; sometimes they defied logic so that the results could not be foreseen, with instructions intentionally vague to allow for interpretation. Characteristically, he would then credit assistants or others with the results…. he always gave his team wiggle room, believing that the input of others — their joy, boredom, frustration or whatever — remained part of the art.
This doesn’t really capture the real impression these drawings first made on me: the realisation that a work of visual art could be made, and appreciated, in the same way as a piece of music. The plans simultaneously governed the form and determined the detail of the finished drawing, and the finished interpretation could be enjoyed for the individual nuances contained within the realisation of an abstract concept. (This also means I don’t care how joyous or bored those assistants were.)