“Lighter Than Air” This exhibition, presented by Blaffer Gallery, showcases Argentine artist Tomás Saraceno’s eye-popping creations. Saraceno approaches art from his background in architecture. He’s influenced largely by the geodesic domes and spheres of Buckminster Fuller (Epcot Center’s “Spaceship Earth”) and utopian ideals of sustainability. Saraceno imagines a future in…