Time-lapse video: Phoenix architect on sustainable buildings

On the first day of summer, at solar noon, the roof appeared to float above Phoenix’s Burton Barr library’s reading room while sunlight illuminated the tops of the support columns through circular skylights. After the sun passed overhead, shadows climbed the east wall like a reverse waterfall.

When Burton Barr library was built, the architects prioritized sustainability. Watch a time lapse of the effect — and listen to the building’s architect Will Bruder talk about the role of architecture in sustainability, especially in the desert.