Columbia subject headings:
Harvard subject headings:
Art, European--20th century
Avant-garde (Aesthetics)--Italy--History--20th century.
Mack, Heinz, 1931-
Manzoni, Piero, 1933-1963.
Piene, Otto, 1928-2014.
Zero (Group of artists)
Princeton subject headings:
Art, European--20th century.
Artists--Italy--Biography.
Manzoni, Piero, 1933-1963.
Zero (Group of artists)--Influence.