What is at the heart of a work of art? What if the art is a conductor of cosmic activity? Lucy Pullen's sculptures, created with the help of astrophysicists and engineers, are live conductors of cosmic rays. These rays (they're actually particles, but they're called rays) enter the earth's environment after being burped forth by supernovas and black holes. Joining The Cloud Chamber are Pullen's drawings of the landscape outside her apartment window in British Columbia. For Pullen, the particle contrails and the lines of the drawings are somehow parallels, and tonight she'll give a talk about why. "In terms of my own artistic trajectory," she says, "the cosmic ray is the new super-ball." I want to know what that means. (Henry Art Gallery, 4100 15th Ave NE, 543-2280, 7 pm, $5)