Piaget: What makes the wind? Julia: The trees. Piaget: How do you know? Julia: I saw them waving their arms. Piaget: How does that make the wind? Julia: I saw them waving their arms. Piaget: How does that make the wind? Julia: (Waving her hand in front of his face): Like this. Only they are bigger. And there are lots of trees. Piaget: What makes the wind on the ocean? Julia: It blows there from the land. No it’s the waves….