“Worlds in Collision,” which opened Friday, celebrates Carlos Villa’s work and influence as a teacher, curator, artist and activist in San Francisco. The exhibition explores Villa’s vibrant aesthetic that brought him acclaim in the 1970s, including large installations with feathers, blood, bones and tattoos. The retrospective has the distinction of being the first major exhibition of the work of a Filipino American artist at an American museum, and the Asian Art Museum’s first retrospective devoted to a local artist.