Juanita, age 7, is working with clay in art class, and she r…

Juanita, age 7, is working with clay in art class, and she rolls a round ball of clay between her hands until it becomes a long rope. However, she decides that she would prefer that the clay be in the shape of a ball again. Juanita knows that this is possible. Piaget would say that Juanita is demonstrating an understanding of __________.