Piaget's work demonstrated quite clearly that a child's representation of the world is different from that of an adult. For example, most adults realise that a volume of water remainds constant when poured into a taller, narrower container, even though its level is now higher. However, early in the preoperational period, children will fail to recognise this fact; they will say that the taller container contains more water. The ability to realise that an object retains mass, number or volume when it undergoes various transformations is called conservation; the transformed object conserves its original properties.
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