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

nothing really mattress...
 
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The mattress of this bed is comprised of thousands of interconnected push-rods held suspended above individual springs to exactly conform to every portion of a body resting on its surface.
Firmness of the tension can be adjusted for different areas, and heating would also be an option.

Electromagnet Mattress Electromagnet_20Mattress
Deluxe model. [tatterdemalion, Oct 11 2016]

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       Anyone can see...
...that this idea should have been about collecting human fingernails.
DrBob, Oct 12 2016
  


 

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