Activity

Popper says there are three worlds (OK 107):

I suggest…that there are physical worlds and a world of states of consciousness, and that these two interact. And I believe that there is a third world…
Among the inmates of my ‘third world’ are, more especially, theoretical systems; but inmates just as important are problems and problem situations. And I will argue that the most important inmates of this world are critical arguments, and what may be called—in analogy to a physical state or to a state of conscious- ness—the state of a discussion or the state of a critical argument; and, of course, the contents of journals, books, and libraries.