While Dia searches for a new home, the arts org has teamed up with Washington Heights' Hispanic Society on a three-year collaboration. The first showcase is of Francis Alÿs, a Belgium-born transplant to Mexico City known for monumental projects — including pushing a block of ice through the streets until it melted, marking the Green Line (between Israel and Palestine) with a leaking can of paint, and moving a mountain. Here, Alÿs displays nearly 300 reproductions of a now-lost 19th-century painting by French artist Jean-Jacques Henner depicting a fourth-century hospital builder, St. Fabiola. Collected by Alÿs on visits to flea markets and antique shops around the globe, the replicas are a tribute to a great work of art we'll never know.