According to Piaget' constructivism theory, assimilation tends to reuse the schema to fit the new information. This occurs or may occur when a person' experiences are in line with his internal representations of the world. When Joy sees the moon in the night sky (new information), he assimilates and incorporates it into an already existing framework (sun) without changing that framework. The pre-existing schema (sun) gets a new schema (moon) which is similar in size and Joy constructs assimilation.