Frank Gehry grew up in the same Toronto neighborhood which houses the Art Gallery of Ontario, and this week, he returned home to present the AGO with his plans for the museum’s latest expansion. “Mr. Gehry’s design includes a frontal promenade covered by a tilted 60-foot-high glass window the length of two football fields. There will be multistory light blue titanium walls intended to fade into the sky and turn gold on cloudy days. A grand glass roof will cover the museum’s central Walker Court. And a giant winged spiral staircase made of Douglas fir will double as a piece of interior sculpture that soars into the court’s glass ceiling.”