In 1999, with some help from the inmates at Milan’s San Vittore Prison, the Italian artist Michelangelo Pistoletto finally completed an installation he’d envisioned in the 1970s. The project was called Spazio Libero, and entailed “a free space inside a prison, a mental space, a behavioral space, a virtual space that implies the concept of freedom of thought.” Twenty-four years later, promoting peace and social awareness still remains a focus of Pistoletto’s practice. At Palazzo Reale he is hanging hundreds of doves from the museum ceiling. It’s an homage to Picasso, who showcased his Guernica in the same room in 1953. The doves carry an important message of postwar rebirth. —Elena Clavarino