On display are two examples of Nauman's installations in which the visitor's body is forced by a constructed space as in Diagonal Sound Wall (Acoustic Wall), 1970 or made difficult to locate the sound as in Sound Breaking Wall, 1969. Both are part of the group of works donated in 1992 to the Guggenheim Museum in New York
https://www.palazzograssi.it/en/exhibitions/current/bruce-nauman-contrapposto-studies/