When my children were small, they would "hide" in their beds. I would walk in to find a lump under the covers and a little voice saying "Find me mummy". The fact that the child couldn't see me was their proof that I couldn't see them. Then they grew up a bit and this wonderful game stopped. They had in fact passed from the Piagetian phase of preoperational (2-7 years old) to concrete (7-11/12) thinking. When a child passes from one phase of brain development to another, they are able to understand things that at an earlier age were incomprehensible to them. The child hasn't become smarter, they have however become wiser. They have the same brain, but it is now capable of thinking in ways that were previously impossible.
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