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An object permanence box is a Montessori material that helps babies understand that objects still exist even when they’re not in plain view. The box has a hole on top and a window on the side, and babies drop a ball into the hole, which then rolls out of the window. The goal is to show that the ball still exists even after it disappears, and to help children understand how to predict outcomes.

The box helps children practice hand-eye coordination, and understanding object permanence signals an important development in an infant’s working memory. It also marks the beginning of a baby’s understanding of abstract concepts.