“Tidal Response,” an undersea exploration of art and science currently exhibiting at the Petaluma Arts Center, is making waves with a stunning display of conceptual works and literal representations of the ocean’s fragile array of life, including the precious coral reefs. One of the world’s most endangered environments, coral reefs are largely hands-off even for scientists who want to study and save them, but this week, the arts center brings the coral to you in the 3D Modeling Demonstration of Undersea Coral Specimens. See highly detailed models and learn about coral restoration on Thursday, Aug. 31, at PAC, 230 Lakeville St., Petaluma. 7pm. $5. 707.762.5600.