essively more ubiquitous over time. 'Big Ben' can then be offered as a metadata annotation for the user to accept or reject. However, having automatically identified that it is Big Ben that the user is looking at, there is an opportunity to add additional extended metadata information to the image, for example, see below. 10.4.4 Optional Extended Image Metadata for Big Ben Big Ben is one of London's best-known landmarks and looks most spectacular at night when the clock faces are illuminated. You even know when parliament is in session; because a light shines above the clock face. The four dials of the clock are 23 feet square, the minute hand is 14 feet long and the figures are 2 feet high. Minutely regulated with a stack of coins placed on the huge pendulum, Big Ben is an excellent timekeeper, which has rarely stopped. The name Big Ben actually refers not to the clock-tower itself, but to the thirteen ton bell hung within. The bell was named after the first commissioner of works, Sir Benjamin Hall. This bell came originally from the old Palace of Westminster; it was given to the Dean of St. Paul's by William III. The BBC first broadcast the chimes on the 31st December 1923 - there is a microphone in the turret connected to Broadcasting House. 10.4.5 Mobile Metadata's Contribution to Localised Offer Opportunities, Progressive Mapping and Point and Listen Applications There are of course various related localised 'offer opportunities' associated with this 'engage- ment moment', a Macdonald's 24-hour 'Big Ben Burger' or the latest geospecific downloadable Big Ben ring tone. Of course, if the super phone has decent solid-state microphones, then the user can record his own ring tones and use them and/or upload them with a suitable spatial, temporal and personal metadata tag. Geospatial value is of course closely linked, or could be closely linked, to progressive mapping applications (where only relevant parts of the map are downloaded as you need them) and wide-area 'point and listen' applications. Point straight ah