Aaron lives in a city in the United States. He has a wife and six children. They always travel together. They collect（收集） 1,000 rocks from different places. After that, the family begin to paint the rocks.

The rocks look like lovely faces. Aaron and his family put 500 rocks in a museum for people to see. But what about the other 500? The family hide（藏起來） them all over the city. Now, parents and children in the city enjoy going out to find the little rocks.