Conceptual? Yes. Intelligent? Yes. Over my head? Yes. Local artist Bill Fontana is an international phenomenon and has been a pioneer of sound art for the past 40 years. Turning what we're accustomed to with visual art on its head, it is not what we see but rather what we hear that is Fontana's body of work. He calls it sculpture, but what you're looking at in his work is only an instrument that generates the desired effect. And this time around, the SFMOMA building itself is the medium for Fontana's latest site-specific sound sculpture.