Ideas in the individual mind he called World 1. Ideas or predispositions that could be transferred horizontally by word of mouth or vertically between generations he called World 2—or, in shorthand, culture. It is only when knowledge can be succinctly described in words (or images, or mathematical symbols, or musical notation)—and rationally challenged if necessary—that effective change can be made at perceptible speed. This is World 3 knowledge.
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