Half a croissant, on a plate, with a sign in front of it saying '50c'
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Boat shoes 3

Make a submarine and walk on water with it
 
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Featuring a zorb-like unidirectional treadmill and three motors facing in each of three directions, this apparatus adjusts its weight to precisely counterbalance a person standing on top. If the person walks, it moves accordingly in whichever direction, such that the person looks as if he is walking on water.
Voice, Jan 14 2021

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       Is the walker inside the zorb, or on top?
pertinax, Jan 14 2021
  

       He's on top. Although a version with the zorb on top with the walker may be fun in rain or storms. On the down side it would also be safer.
Voice, Jan 14 2021
  
      
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