 It was demonstrated at the 1961 Hanover Fair, and became well known also outside of the technical world thanks to Frieder Nake's pioneering computer art work.Other plotters designed by Zuse include the ZUSE Z90 and ZUSE Z9004.In 1967, Zuse suggested that the universe itself is running on a cellular automaton or similar computational structure (digital physics); in 1969, he published the book "Rechnender Raum" (translated into English as "Calculating Space").