Piaget’s greatest contribution was to change psychologists’ focus from what we know to how we know. He studied how the mind organizes and transforms information— how it shapes information. The mind is not a blank screen; it is not a camera or a mirror that simply reflects what it sees. It is an active participant in knowledge. The mind takes in information and actively organizes it. As such, it constructs a view of reality through this shaping and transforming of information. This concept is referred to as Piaget’s constructivist view of knowledge. Moreover, the way that the mind organizes information changes across child development. So younger children do not simply know less than older children or adults; they know differently.