The exhibition of the ZKM has gathered a wide series of international works create between 1961s and 1973, which were presented in Zagreb during two historic exhibitions. All the authors decline some kinds of " rules of production" with many personal variations: physical, optical or mechanical processes at the beginning, more formal after the emergence of the computer. The visible rigor does not exclude the search for a sensitive effect of perception: it sometimes results from a visual physical effect introduced by the author. In the first works with computer, taking the shape of a random process, it contributes to unexpected events in the visual perception of the work. The exhibition thus rediscovers a whole moment of the art history, of which the actors were not necessarily conscious...

Margit Rosen , curatrice de l'exposition, Peter Weibel, directeur du musée, travaux en cartes perforées de 1973.