We call those works of art concrete that came into being on the basis of their inherent resources and rules - without external borrowing from natural phenomena, without transforming those phenomena, in other words: not by abstraction.
From 1967 to 1971 he served as a member of the Swiss National Council. He was elected to the Zurich municipal council in 1961. NAP Verlag Zürich 2010 ISBN 978-3-9523615-4-2.
