When we try to think of movement, and arrive at a philosophy of movement, we immediately place ourselves in a critical or verificatory attitude, we ask ourselves what precisely is given to us in movement, we make ready to reject appearances in order to reach the truth concerning movement, and we remain unaware that it is precisely this attitude which reduces the phenomenon and must prevent us from coming to grips with it, because it introduces, with the notion of truth in itself, assumptions liable to conceal from me the genesis of movement for me.