Popper's three worlds

Popper's three worlds is a way of looking at reality, described by the British philosopher Karl Popper in a lecture given in August 1967. The concept involves three interacting worlds, called world 1, world 2 and world 3.

"World 3" redirects here. For the grouping of countries known as the "third world", see Third world. For the Maoist theory, see Three Worlds Theory. For the system dynamics model used in The Limits to Growth, see World3.
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