Tuesday morning Heather and I went to Pettygrove Park, and small urban oasis set in a 70’s urban renewal zone largely characterized by monolithic, concrete apartment blocks. It is one of three plazas in the area designed by renowned landscape architect Lawrence Halprin, along with the Keller Fountain (formerly the Forecourt Fountain) and the Lovejoy Fountain. We went there, instruments in hand, to check out the acoustics of the site for a planned installation of music and dance for the 2008 PICA TBA Festival (Festival of Time-Based Art).