Half a croissant, on a plate, with a sign in front of it saying '50c'
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Colour swatch clouds

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Google tells me that cloud colour is down to Mie Scattering, where clouds scatter all wavelengths of light equally to produce mostly white. Variations on the whiteness depend on where you're seeing the cloud from and the thickness of the cloud.

A series of huge dispersive prisms is arranged to break down the light arrays into beams of differing wavelengths and turn the clouds into a random celestial display to rival the Northern Lights.

Phrontistery, Aug 31 2012

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       Corrective science welcomed but please promote the concept.
Phrontistery, Aug 31 2012
  

       Once everyone starts mothballing their armed forces—which should be any day now, given the unwavering progress of human evolution—we'll have lots of dough for projects like this.
Ander, Sep 02 2012
  
      
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