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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 sand castle 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, simply for the fun of it, but there are also sand-sculpture contests for adults that involve large, complex constructions. The largest sand castle 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 sand castle. His sculpture consisted of one ton of sand and 10 litres of water to sculpt. == Construction == Sand grains will not stick together unless the sand is reasonably fine. While dry sand is loose, wet sand is adherent if the proper amounts of sand and water are used in the mixture. The reason for this is that water forms little "bridges" between the grains of sand when it is damp due to the forces of surface tension. When the sand dries out or gets wet, the shape of a structure may change, and "landslides" are common. Furthermore, the mixture of fine (mostly sharper) and coarse sand granules is very important to achieve good "sand construction" results. Fine granules that have been rounded by the natural influences of seas, rivers or fluvials, in turn negatively influence the bonding between the individual granules as they more easily slide past each other. Research is thus necessary to find the most suitable sand to achieve an optimal, landslide-free construction. Shovels and buckets are the main construction tools used in creating sand castles and sand sculptures, although some people use only their hands. Water from the sea to mix with the sand can be brought to the building site with a bucket or other container. Sometimes other materials, such as pieces of wood and plastic are constructed to hold piles of sand in place and in specific shapes - these are called forms. Sand sculpting as an art form has become very popular in recent years, especially in coastal beach areas. Hundreds of annual competitions are held all over the world. Techniques〔http://sandisle.com/gravity-defying/〕 can be quite sophisticated, and record-breaking achievements have been noted in the ''Guinness World Records''. Sometimes, contests are staged as advertising or promotional events. Most Sand sculptors come from other disciplines but there are a few that earn their living solely from Sand related activities. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Sand art and play」の詳細全文を読む スポンサード リンク
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