In the Central American country of Costa Rica archaeologists have found smoothly carved stone spheres of various sizes, but they don't know who made them nor why. The first story is a fanciful explanation of the origin of these stone balls.

In the first story Costa Rica has been destroyed by an erupting volcano. Rose and Carol are invited to join children from all over the world helping to rebuild the landscape. They spend the summer doing such things as carving trees, painting flowers, caring for baby animals and birds, and riding around on a flying carpet with a boy from Arabia....