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Remember that sand can be compacted into sand stone with enough pressure and time. The physicists will tell you all about "interstitial bridges" and other terms that I do not fully understand, but as a master sand sculptor, I can tell you that all sand is not created equal -- sculptures made from sand with a higher silt/clay content, such as the material you find on the US Gulf Coast, will stand longer because the clay holds the moisture longer. To extend the life of the sculpture we spray the completed work with a solution of white glue (non-toxic, biodegradable), diluted about 5 to one with water, on the surface. This creates a thin, "hard candy shell" that holds in the moisture and helps stave off weather damage. The ones I've seen done are normally very highly compacted damp sand. They use various methods to compress it as tightly as possible so the individual grains have as much contact with each other as the artist can achieve. Even so, gravity will eventually win and they will fall apart.

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8y ago
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Q: How does a sand sculpture keep from falling apart?
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