A crenellated turret here, a winding, arched staircase there, maybe even a giant turtle--fantasy is at the heart of every sandcastle. Summer after summer, both children and adults make valiant efforts to infuse their sandy structures with inspiration, but the results are generally disappointing. With Sandcastles Made Simple--now available in an extremely affordable paperback edition--Lucinda Wierenga, a renowned sand sculptor, puts a permanent...