Tokyo is a very gadget rich environment, but most of them seem to have a useful purpose. For example when running in the park at night (it's far too hot during the day), although fairly well lit there are still areas of deep shadow. Round most dog's collars that are being taken for a walk are flashing lights so as to alleviate the trip hazard these little beasties would otherwise cause.
Another example is the square 'barcodes' they put on their business cards, adverts in magazines and so on. Many newer models of mobile phone have a scanner that can read these bar codes and display the location on a gps map to help guide you to their shop/bar/restaurant. This is because it's impossible to give an exact address in Tokyo due to the sprawling nature of this metropolis.
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