The “W” in the title stands for “world,” and Ms. Fellion and her colleagues do succeed in creating one….John Yannelli and members of the SLC Experimental Music Ensemble contribute a richly textured, partly live score of drones, strings plucked and strummed, swelling distortion, and high hums. The choreography is action-packed with a strong flow, a current that is sometimes tidal, washing the dancers back and forth across St. Mark’s Church, turning the terrarium into an aquarium.