Something like a gigantic bubble was suspended in the courtyard of the historic Palazzo Ducale. This was the installation that lent its title to Argentina-born, Germany-based artist Tomás Saraceno’s second solo show at the Genoese gallery located inside the fifteenth-century building. Hung from ropes attached to the colonnaded structure, Biosphere MW32, Air-Port-City, 2007, was made of thirty-two PVC pillows, inflated by a compressor and forming an enormous transparent sphere that could be inhabited. With its hollow interior, which one could enter during the opening reception only, it is a