Geometric Optics - discussing the Walkie Talkie skyscraper and the Nottingham Sky Mirror. We're on Facebook at http://www.facebook.com/sixtysymbols The Walkie Talkie, or Walkie Scorchie (?), is a new building in London which has been reflecting light in a rather hazardous way! The Sky Mirror is a sculpture at the Nottingham Playhouse. This video features Professor Mike Merrifield from the University of Nottingham. Visit our website at http://www.sixtysymbols.com/ And Twitter at http://twitter.com/#!/periodicvideos This project features scientists from The University of Nottingham http://www.nottingham.ac.uk/physics/index.aspx Sixty Symbols videos by Brady Haran A run-down of Brady's channels: http://bit.ly/bradychannels