ARTS: Bolinas multimedia artist Charlie Callahan, above, is obsessed with sea urchins—their scavenger lifestyle, the mandala pattern left on their shells after they die and lose their spikes. His installation at the Bolinas Museum explores themes of death, beauty, isolation and ecological upheaval through the creature’s image, along with film, beach litter, found objects, sound and light.   David Briggs

When you enter the exhibit hidden behind a black curtain at the Bolinas Museum, a glowing blue sea urchin six feet in diameter emerges from a wall. From inside the hollow sculpture come ambient recordings; they sound at times like a buckling bridge and a spaceship zooming through a galaxy. A slit of light along one wall illuminates bottle . . .

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