[Sub-Stage] 5 Tertiary circular reactions, novelty, and curiosity [Age] 12–18 months [Description] 
"Infants become intrigued by the many properties of objects and by the many things they can make happen to objects; they experiment with new behavior".[25] This stage is associated primarily with the discovery of new means to meet goals. Piaget describes the child at this juncture as the "young scientist," conducting pseudo-experiments to discover new methods of meeting challenges.[26]