That's always struck me as kind of interesting though. Just as logical positivism and the dictum "scientific logic is the only valid mode and 'science' the only proper subject of philosophy" was dying down on one side of the English Channel, on the other up rises "everything but scientific logic are valid modes and science or anything else is a proper subject for philosophy" as the motto of postmodernism. Not sure there's any cause-and-effect there -- maybe lopo influenced by early, pomo by later, Wittgenstein -- but a good name for pomo might be "anti-lopo", or "alogical negativism". Each certainly led to some bombastic extremes, from the lopo's throwing out ethics to the pomo's inviting in dada. Seems whenever any movement tries to come up with a definition for philosophy beyond "clear thinking", zaniness is bound to ensue.