We have been fascinated by Tomás Saraceno for some time, an artist attuned to the changes we have wrought on the world—and a body of work that envisages another. Now he’s coming to Mona, contagious curiosity and all. It’s our biggest exhibition in years. Opening this December with a two-day art and music extravaganza at Mona, featuring Kimbra and heaps, heaps more.