Robert Chambers, America's Heartbeat, 2005. Aluminum, sand, electrical components. Collection of Institute of Contemporary Art, Miami. Gift from the Collection of Robert S. Wennett and Mario Cader-French. Robert Chambers, America's Heartbeat, 2005. Aluminum, sand, electrical components. Collection of Institute of Contemporary Art, Miami. Gift from the Collection of Robert S. Wennett and Mario Cader-French.