How well do you know Fountain Place, the city's beloved "rocket ship" skyscraper?

Some thirty years after the completion of the prismatic tower, it's finally getting the twin that was always supposed to rise next door. A tad shorter and with a slightly different geometry, the new tower will be residential, and it won't be an exact doppelgänger, but it will be pretty close.

Over the years, however, technology has changed, and that means the windows on the new building will be double-paned instead of single, as in the original. To insure a precise match in color, Page Architects, who are designing the new tower (the original was by Harry Cobb of Pei, Cobb, Fried), got permission to test eight of the new windows in the first tower. They got pretty darn close. Can you tell which are the new widows? The answers are below, outlined in red.