IANNIS XENAKIS Diatope (Polytope de Beaubourg), 1977 Polytope de Cluny, 1972 “An art like music, in itself, without anthropomorphic or realistic reference. This is the meaning of the polytopian adventures (of the Polytopes of Montreal (1967), of Persepolis (1971), of Cluny (1972), of Mycènes (1978), of the Diatope of the Centre Georges Pompidou (1978)). It is that the search for a pan-musical expression.” IX