Half a croissant, on a plate, with a sign in front of it saying '50c'
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The glass is indistinguishable from full.

 Viewed from directly above a glass of water has a graded refractive index so that it appears full, regardless of how much water is in it.
  (+3)
(+3) 		  [vote for,
against]

half full, half empty, you need a different glass, etc.

finally a way to make the glass look full regardless of what is going on. observing the glass from directly above, the gradient refractive index of the glass (or polymer) that the glass is made from causes it to look like it is full of water. Vehemently optimistic.

—beanangel, Nov 21 2016

Pretty screwy... https://i.ytimg.com...o/maxresdefault.jpg
[2 fries shy of a happy meal, Nov 22 2016]

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       Is this a proposal for a special type of glass? Or an observation on existing glasses?   

       I should also mention, perhaps, that a glass filled with water is a great disappointment, unless you have a goldfish.
—MaxwellBuchanan, Nov 21 2016
   

       [Max], I woulda thought you drank your goldfish out of Wedgwood.
—the porpoise, Nov 21 2016
   

       Actually Spode do some very elegant goldfish serving bowls.
—MaxwellBuchanan, Nov 21 2016
   

       ^Platinum fish for you, shirley? Gold seems so Nouveau riche.
—AusCan531, Nov 21 2016
   

       Though a glass appearing full when it is indeed less might be fraud? [+]
—whatrock, Nov 21 2016
   

       If the interior if the glass were mirrored and shaped like two concave dishes with a hole in the top of one then the glass would always appear full without a lens cover.
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