Aaron Leif Nicholson has an affinity for creating life-sized sculptures of imposing characters (like witch doctors and Yetis) that seem to have stepped straight out of a nightmare. Nicholson’s “Coney Island Star Man” is a prime example: faceles and hunched over the ground, he lurks on a beach as if he’s watching you. Nicholson brings his sculptural background to other works as well, which include mixed-media drawings and paintings, lending traditionally two-dimensional art a three-dimensional quality.