Half a croissant, on a plate, with a sign in front of it saying '50c'
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Relativity Subway

The slower the train moves the longer passengers are exposed to ads.
 
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Place markings in a subway tunnel indicating they are spaced, for example, one meter apart. These can be seen through the windows of a moving train. In actuality the markings are only spaced one decimeter apart. Passengers will think the train in moving ten times faster than it really is.
rcarty, Aug 04 2011

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       The lack of Blue Shift will reveal your strategem.
8th of 7, Aug 04 2011
  
      
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