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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.
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]
[link]
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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. |
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Would there be any advantage to varying the shapes or alternating surface colors to produce a variety of rainbow shapes? |
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Make this into a fluidized bed, then shine lasers onto it ... |
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Call it Art. Then some idiot will pay a fortune for it. |
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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. |
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travbm, A sandbox filled with glass spheres will produce a
rainbow which will always appear to encircle the viewer's
shadow's head. |
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Can your colored sand in a bottle do the same? |
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Kids tend to put everything in their mouths. I suppose glass
spheres would be no more harmful than their parent material.
[+] |
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if you make them out of quartz they will transmit UV spectra, causing fluorescent things to be fluorescent, although not more fluorescent |
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Not sure how this one got by me. (+) |
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Should be able to "Gorilla Glass" the outside surface of the
spheres, to extend the useful life (possibly already done in
some fashion for the road use ones...). |
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