World From Top, By Klaus Lerdorf

In response, Freud proposed that we do not move about in a common world, but a common thought process. He believed that all the actions of a person is motivated by one thing: lust. This led to numerous theories about reactionary consciousness.
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Some philosophers, often inspired by David Lewis, argue that metaphysical concepts such as possibility, probability and necessity are best analyzed by comparing the world to a range of possible worlds; a view commonly known as modal realism.