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I wonder what's in that river sand that makes it stick together?
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The grains of the sand they use is sort of cube shaped. The sort you usually see on beaches has roundish grains. Then they wet it and pound it hard into dense piles before they start sculpting. I saw a festival like this in the Netherlands - it's so weird to see it close up. Even if it rains or is really windy it hardly makes a difference. If untouched, it takes months to fall apart.