With GPS technology at our fingertips and Siri available to navigate our every turn, paper maps have been rendered obsolete. But that is exactly what Japanese photographer Sohei Nishino has created with his series of collaged "Diorama Maps," which went on view Friday at the San Francisco Museum of Modern Art. After initial research of a city, Nishino spends up to three months walking it while snapping photos in black and white. "He climbs up to rooftops and high floors of buildings to get a multifaceted bird's-eye view," curator Corey Keller said. "These vantage points give him an alternative perspective of the city."