LAST APRIL, Dandelion Dancetheater showed a two-minute excerpt from the "Undressed Project," which choreographer-dancer Eric Kupers has been involved with for the past three years. It featured a quartet of dancers with no clothes, no shoes, no makeup. Just stripped bodies in all their flaws, glories, and abundance of skin. The excerpt didn't really communicate much. But the questions it raised about representation, image, and preconceptions certainly seemed intriguing. While we commonly talk about the body being the dancer's tool, we rarely think of it in as vulnerable and exposed a state as which Kupers uses it. One of the participating dancers, for instance, has a prosthetic leg. How do we look at that person? Is he or isn't he like everyone else? Night Marsh, the culmination of Kupers's "Undressed Project," involves 15 dancers of all sizes, training, and ages. It includes video and text by Kupers; Jess Hooks designed the set. A collection of musicians – Lori B, Down River, Elaine Buckholtz, Live Human and Patrick Cress, and Telepathy – provide the score to what is sure to be a provocative show. Fri.-Sat., 8 p.m., 1519 Mission, S.F. $10-$25 sliding scale. (415) 554-0402. (Rita Felciano)