I was thinking about Schrodinger's cat - I hadn't really thought too hard about the metaphor before.
The concept was a revolution in Scientific thinking. The old thought process was: this unknown is actually one way or another, it's just that we don't know yet. There is a presupposition inherent within it, that all knowledge is attainable (it's just around the bend, really!)
So in his 'metaphor' or whatever you want to call it (epistemological theory?) there are two important revelations: The first is that an observer effects a system, so simply by knowing something you change the something itself (see Heisenberg). The second is the one I'm getting at: If there is an unknown (is it A or B?) then this unknown is neither A nor B. Simple as that. We cannot assume that the unknown is one or the other (and we just don't know it yet). It really is neither A nor B (the cat is not alive or dead).
I was thinking about this in the context of quantum theory and the nature of reality and the whole "we are surrounded by probability clouds" vision.
His metaphor is genius, in that it ties the outcome to a truly random and chaotic event (the decay of a radioactive element).