Half a croissant, on a plate, with a sign in front of it saying '50c'
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Real Rainbow Sandbox

Precisely like a real rainbow
  (+12)(+12)
(+12)
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Start with an empty sandbox.

Fill it, not with sand, but with tiny glass spheres, the type which are sprinkled on to road marking paint to make it retroreflective.

These marking spheres cost as little as 20 dollars for a 50 pound bag. Given that ordinary sand costs 3 to 6 dollars for that amount, it's not insanely expensive.

More importantly, since these glass spheres reflect and refract light in the same manner as water spheres, they produce a rainbow when viewed in the sunlight from the proper angle.

goldbb, Oct 28 2015

Glass Bead Rainbow http://www.atoptics.co.uk/fz822.htm
[goldbb, Oct 28 2015]

sand in a bottle https://www.etsy.co...?q=sand+in+a+bottle
different colors of sand in bottles. [travbm, Oct 29 2015]

http://photo.accuwe...7/500/0aaaf0bee.jpg [goldbb, Oct 04 2016]

http://photos1.blog.../glass_bead_bow.jpg So I lied: The rainbow here surrounds the shadow of the camera taking the picture, not the shadow of the head of the person holding the camera. [goldbb, Oct 04 2016]

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       Sounds beautiful.
blissmiss, Oct 28 2015
  

       But suspended silica micro-beads are custard. Just don't dive in.
LimpNotes, Oct 28 2015
  

       Beach glass is dull due to years of being moved around by ocean waves. Even the most rambunctious child would take decades or centuries to make enough of these glass microbeads dull enough for the rainbow to not be seen.
goldbb, Oct 28 2015
  

       Would there be any advantage to varying the shapes or alternating surface colors to produce a variety of rainbow shapes?
4and20, Oct 29 2015
  

       Make this into a fluidized bed, then shine lasers onto it ...   

       Call it Art. Then some idiot will pay a fortune for it.
8th of 7, Oct 29 2015
  

       Why not buy clear sand and food coloring. Make the sand the colors of the rainbow and have sections of the sandbox with a different color? By the way they do this with sand in a bottle already.
travbm, Oct 29 2015
  

       travbm, A sandbox filled with glass spheres will produce a rainbow which will always appear to encircle the viewer's shadow's head.   

       Can your colored sand in a bottle do the same?
goldbb, Oct 04 2016
  

       Kids tend to put everything in their mouths. I suppose glass spheres would be no more harmful than their parent material. [+]
whatrock, Oct 04 2016
  

       I like this!   

       if you make them out of quartz they will transmit UV spectra, causing fluorescent things to be fluorescent, although not more fluorescent
beanangel, Oct 05 2016
  
      
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