Super Sand Castle Saturday - Mathstart: Level 2 HarperCollins Library Author:Stuart Murphy One Saturday at the beach, Laura, Juan, andSarah decide to have a sand castle contest. As the tide rises,the walls get longer, the towers get taller, and the moats getdeeper. The friends measure their sand castles with spoons,shovels, and bare feet until Larry the lifeguard and his tapemeasure surprise them all.