For forty years, Trisha Brown has had one primary goal: “I’m trying to make the perfect dance, that’s what drives me,” she’s said. The award-winning choreographer, opera director, and accomplished artist (whose drawings are regularly displayed in galleries) is celebrating the fortieth anniversary of her company with a special five-night, ten-show season at the Baryshnikov Arts Center’s Howard Gilman Performance Space. In this forty-five-minute program, Brown will be looking back with the 1994 solo “If you couldn’t see me,” in which she collaborated with Robert Rauschenberg, and the 1980 rarity “Opal Loop/Cloud Installation #72503,” in which she worked with cloud sculptor Fujiko Nakaya. Continuing the celebration, she will complete her five-part lecture series at Dance Theater Workshop on April 11 with a discussion about her visual art and on May 23 with an examination of her legacy. And on May 1, her yearlong residency at Dia:Beacon ends with the staging of “Opal Loop/Cloud Installation #72503,” 1963’s “La Chanteuse,” a solo that hasn’t been seen since its initial presentation, and “Rafts” on the Hudson River (weather permitting).