“Another set of philosophical questions concerns change or becoming rather than being. Of the things in our experience to which we would unhesitatingly attribute existence, we would also say that all of them are subject to change. They come into being and pass away; while in being, most of them move from one place to another; and many of them change in quantity or in quality: they become larger or smaller, heavier or lighter; or, like the ripening apple and the aging beefsteak, they change in color.”