Building sand castles is one of the best parts of a visit to the beach. With just a shovel and a pail, you become a sculptor and an architect, carving fortresses in the sand. Just imagine the sandcastles you could build using real construction equipment instead of a small shovel. You could probably even reshape an entire landscape.
We usually think of sculptors molding clay, carving stone, or casting metal. But some artists use the earth itself as a medium. American artist Robert Smithson described sculptures of this kind as earthworks. But like a sand castle, which can wash away with a change of the tide, earthworks usually don’t look the same for very long.