The most daring piece of public architecture in the city is this downtown public library, designed by local architect Will Bruder. The five-story cube is partially clad in enough ribbed copper sheeting to produce roughly 17.5 million pennies. The design makes use of the desert’s plentiful sunshine to provide light for reading, but also incorporates computer-controlled louvers and shade sails to reduce heat and glare. Architecture mavens in town for the summer solstice, June 21, should check the library schedule; most years the architect gives a talk at noon on that day, when a set of skylights is designed to create a shadow dance on the walls.