Michelangelo, I think, used to say he'd look at a piece of rock and he'd "see" the sculpture in there. It was just a matter of taking the time to let it loose. Sometimes it is like that for me with puns and parodies. They're just floating in space, perfect things falling out of heaven, ready to be grabbed and used.
Either him or Irving Stone. So maybe it was a stone looking at a rock...or was it a Stone?