Un castillo de arena es una escultura hecha de arena, normalmente un castillo, que se suele construir en playas. Aunque popularmente se construyen por diversión (especialmente los niños), también está considerado como una forma de arte, por la compleja laboriosidad que pueden llegar a alcanzar. Hay numerosos concursos de construcción de castillos. Otra modalidad consiste en hacer esculturas que no sean castillos (como estatuas, rostros, etc) con la arena, aunque no está tan extendida.

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Sand art is the practice of modelling sand into an artistic form, such as a sand brushing, sand sculpture, sandpainting, or sand bottles. A sandcastle is a type of sand sculpture resembling a miniature building, often a castle. The two basic building ingredients, sand and water, are available in abundance on a sandy beach, so most sand play takes place there, or in a sandpit. Tidal beaches generally have sand that limits height and structure because of the shape of the sand grains. Good sculpture sand is somewhat dirty, having silt and clay that helps lock the irregular-shaped sand grains together. Sand castles are typically made by children for fun, but there are also sand-sculpture contests for adults that involve large, complex constructions. The largest sandcastle made in a contest was 18 feet tall; the owner, Ronald Malcnujio, a five-foot-high man, had to use several ladders, each the height of the sandcastle. His sculpture consisted of one ton of sand and 10 litres of water to sculpt.

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