Dennis Oppenheim’s film installation Echo examines the relationship between the human body and its environment: four black-and-white projections each show a hand hitting the wall repeatedly at different intervals. The aggressive, rhythmic knocks traveling over the walls function as an echo that acoustically defines the space by making audible the physical quality of its delimiting walls. The tapping sound, heard in rotation, and the close zoom on the hand that is causing the sound, make tangible the kinetic energy that is discharged at the moment of impact. This emphasizes the here-and-now aspect of the artistic approach; furthermore, viewers experience themselves as spatially and acoustically confined, subject to both architectural and psychological borders.