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Gradient Tog Duvet

Tapered quilt
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Sleeping under a conventional, constant-tog duvet, the only method of regulating temperature is in binary: either expose a limb to the cold room air, or don't.

Not so with the Gradient Tog Duvet. Much wider than the bed, it begins as the thickest, plushest quilt you could ever desire, but thins across its width all the way down to a single sheet. Now your temperature control is continuously variable -- to warm up, pull from the left; to cool down, pull from the right.

The double bed version is thickest in the middle, and tapers in both directions (a 'reflected' gradient, in Photoshop terminology).

mitxela, Jan 14 2016

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       Yes but is it a linear or exponential gradient?
hippo, Jan 14 2016
  

       What if there are two in the bed?
AngelEleven, Jan 14 2016
  

       [AngelEleven], clearly, the Little One would say 'Roll over, I'm crowded', no?!
Sgt Teacup, Jan 14 2016
  

       What if there are three in the bed?
Ian Tindale, Jan 14 2016
  

       In the world of optics and imaging, a variable neutral density filter is often made from a pair of polarising filters, one of which can rotate.   

       Perhaps a kind of low tog polarising duvet could be formulated, somehow, and a pair of those could be able to vary from high tog down to low tog merely by rotating the protruding handle attached to the top duvet.   

       Alternatively, merely invent the variable neutral destiny filter and have a reasonably pleasant life.
Ian Tindale, Jan 14 2016
  

       Until you fall out!!
Sgt Teacup, Jan 14 2016
  

       //linear or exponential gradient?// Depends if you measure thickness or insulativity.
pocmloc, Jan 15 2016
  
      
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