Half a croissant, on a plate, with a sign in front of it saying '50c'
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cogs of the realm

coins that are also cog wheels
  (+18, -2)(+18, -2)
(+18, -2)
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The idea is to mint new coins that have a small hole in the centre to receive a spindle, and have their outside edge reformed as the teeth of a cog wheel.

Naturally the range of coins available would have to multiply, to enable each denomination to have different dimensions and teeth characteristics. This will increase their variety of uses.

One side of the coin would present the customary currency information, whilst the other would be reserved for its engineering and size characteristics i.e. number and pitch of teeth; radius; forms a connecting match with...

Uses: encourages children (and adults) to save and have a renewed interest in making simple machines.

xenzag, Apr 16 2006

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       I though "to obverse" was the term used to describe making someone nervous by watching them backing a car into a tight space. Thanks for new word and croissant - making me hungry for breakfast.
xenzag, Apr 16 2006
  

       Your change purse is so meshy.   

       Will also provide a welcome boost to the trouser pocket repair industry [+]
AbsintheWithoutLeave, Apr 16 2006
  

       + quite interesting idea....
xandram, Apr 17 2006
  

       You can make a clock with these here coins. It will break down, but then you could repair it. Eh, [xenxag]?
methinksnot, Apr 18 2006
  

       Maybe you could print blueprints for simple gear-based machines onto the notes.
wagster, Apr 18 2006
  

       Make them well and they would form lethal improvised ninja throwing stars [+]
Mr Phase, Apr 18 2006
  

       // engage and drag each other around. //   

       Gear teeth push, not pull. The leading face of the driving tooth presses against the trailing face of the driven tooth.   

       "Lobe" gearwheels are WKTE.
8th of 7, May 09 2016
  

       Made by Cogswell's Cosmic Cogs of The Jetsons fame?
popbottle, May 10 2016
  
      
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