Peekaboo is a game played over the world（share） Peekaboo is a game played over the world, crossing language and cultural barriers. Why is it so universal? Perhaps because it’s such a powerful learning tool. One of us hides our eyes and then slowly reveals them. This causes peals of laughter from a baby, which causes us to laugh in turn. Then we do it again. And again. Peekaboo never gets old. So why is it that babies across the world are constantly rediscovering peekaboo for themselves? An early theory of why babies enjoy peekaboo is that they are surprised when things come back after being out of sight. This may not sound like a good basis for laughs to you or I, with our adult brains, but to appreciate the joke you have to realise that for a baby, nothing is given. They are born into a buzzing confusion, and gradually have to learn to make sense of what is happening around them. You know that when you hear my voice, I'm usually not far behind, or that when a ball rolls behind a sofa it still exists, but think for a moment how you came by this certainty.

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