What is the task that Piaget and Inhelder devised to demonstrate egocentrism during the preoperational stage?

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The task that Piaget and Inhelder devised to demonstrate egocentrism during the preoperational stage is the "three mountains task". In this task, a child is shown a model of three mountains from different perspectives and is asked to identify what the view would look like from a doll's perspective. Children in the preoperational stage typically have difficulty understanding that others may see things differently than they do and therefore struggle with this task.

What Is the Task That Piaget and Inhelder Devised to Demonstrate