Toward the end of this first stage, Piaget says, object permanence occurs. Object permanence means that the baby has come to realize that something exists even when he can’t see it. This is a very important development for children. Before achieving this milestone, babies only think about what is in their view at the time. For example, if we carefully watch babies, we see that before eight or nine months they drop things from the high chair tray without making a fuss. For a young baby, if things are out of sight, they are literally out of mind. From the baby’s point of view, the things no longer exist. Then suddenly, at eight or nine or ten months, when that spoon drops from the tray, the baby leans over pointing and fussing and wanting it back. (p. 82)