Leibniz has a metaphor that he likes: you are near the sea and you listen to waves. You listen to the sea and you hear the sound of a wave. I hear the sound of a wave, that is, I have an apperception: I distinguish a wave. And Leibniz says: you would not hear the wave if you did not have a minute unconscious perception of the sound of each drop of water that slides over and through another, and that makes up the object of minute perceptions. So this is how our conscious perceptions bathe in a flow of unconscious minute perceptions. What I express clearly and distinctly, Leibniz tells us, is what relates to my body.