Shovels and buckets are the main construction tools used in creating sand castles and sand sculptures, although some people use only their hands. A simple sand castle can be made by filling a bucket with damp sand, placing it upside-down on the beach, and removing the bucket. For larger constructions, 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.