Trees of Knowledge
Jean Piaget watched children develop very closely in the mid-20th century, and he realized that they weren't passively internalizing knowledge, like empty vessels to be filled. He proposed that people create knowledge by building mental structures, which he called schema, in a way that makes sense to them (I like to think of little imaginary "hands" building a knowledge tree). The focus on the construction of knowledge, as opposed to its transmission, led Piaget to develop the theory of constructivism …
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