You can’t judge a performance by its promotional photo, but the one for Ms. Vandenbroucke’s new “35 ½” gives us some intriguing hints about what she’s been up to. An index of keywords, superimposed over the image of a rubber boot-wearing dancer, suggests that everything from “radical formalism” to “Swan Lake” to “subtlest dance ever” has been on her mind. It’s worth the trip to Long Island City to see what she and her wonderful collaborators (who include the esteemed dancer-choreographer Vicky Shick) have been cooking up.