Smarty's ball has rolled under the sofa, and he immediately starts to hunt for it. Smarty's behavior illustrates

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Smarty's behavior illustrates the Piagetian principle of object permanence, which is the understanding that objects continue to exist even when they are out of sight. In this case, Smarty knows that his ball exists even though he cannot see it because it has rolled under the sofa. This understanding typically develops in infants around 8-12 months old, but continues to be refined through childhood.

Smarty's Ball Has Rolled Under the Sofa, and He Immediately