Follow a trail past yacht-club docks along a jetty poking into the Bay, and you'll discover an aural oddity: the Wave Organ. Eerie sounds wheeze from repurposed SF cemetery marble statues and PVC plumbing parts, ingeniously reconfigured into acoustic sculpture by Exploratorium artists Peter Richards and George Gonzalez. Depending on the waves, winds and tide, the installation sounds like humming from a cook in a noisy kitchen or spooky heavy breathing on a prank phone call.