The idea that squeezing crystals has electrical consequences is not new. A phenomenon called piezoelectricity, which is exploited in pressure sensors and quartz watches, involves creating a voltage between the ends of a piece of crystal by applying pressure.
The John Hancock Center was completed in 1970, and its gently sloping black steel form remains one of the most-recognizable structures in Chicagoâs famed skyline. John Hancock Center The John Hancock Center (centre building) on North Michigan Avenue in Chicago. Â© Chicago Architecture Foundation A bold form was chosen for the Hancock Center. The tapered rectangular tubeâwith giant trusses on each of the four sidesâreadily shows how the building is supported.
Images related to Chicago. 1  Chicago skyscrapers July 10, 2012, from John Hancock Center looking south. 2  From top left: Downtown Chicago, the Willis Tower, the bucetar, the Chicago L, Navy Pier, the Field Museum, and Millenium Park. 3  Greetings from Chicago Mural - Logan Square, Chicago.  4 Six Corners sunset in Wicker Park, Chicago.