One of the most important media artists to emerge in the 1990s, Mexican-born, Montreal-based artist Rafael Lozano-Hemmer explores the intersection of architecture, media, performance, and the politics of public space. His interactive video and sound installation Frequency and Volume: Relational Architecture 9 (2003) responds to the size and position of visitors’ shadows on the gallery wall, encouraging participants to use their own bodies to tune in to a range of public and private radio frequencies — from commercial music stations to police bands and air traffic control. The radio equipment installed in an adjacent gallery and a sculptural antenna on an outdoor terrace make visible the museum’s status as both a receiver of frequencies and a producer of feedback in a larger spectrum of Bay Area radio culture. The exhibition is part of the 2012 ZERO1 Biennial.