“An artwork is not about the now,” Urs Fischer has said. And yet, his wax sculptures contradict him. As you read this, Fischer’s Leo (George & Irmelin) is already melting. It’s a likeness of Leonardo DiCaprio, caught with his parents in a moment of affection, all three sculpted in wax. Fischer undermines traditional expectations of lastingness by working in an impermanent medium. It’s witty and it’s fun. Go visit Leo before it’s too late! —E.C.