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OCR: the rarefaction of the air," E meaning that the action of the air alone draws the projectile along. But Leonardo, having already shown that the air is moved aside by the bullet, not by itself, reduces this last argument to a logical quandary, pointing out that "it is impossible that at one and the same time the mover should move the movable object and the movable object its mover." F Leonardo's correct explanation of the motion of a projectile, contained in these few succinct phrases, is secondary to the effort he has expended to counter the arguments of a long-existing tradition.