Change in short is no longer looked upon as a fall from grace, as a lapse from reality or a sign of imperfection of Being. Modern science no longer tries to find some fixed form or essence behind each process of change. Rather, the experimental method tries to break down apparent fixities and to induce changes. The form that remains unchanged to sense, the form of seed or tree, is regarded not as the key to knowledge of the thing, but as a wall, an obstruction to be broken down. Consequently the scientific man experiments with this and that agency applied to this and that condition until something begins to happen; until there is, as we say, something doing. He assumes that there is change going on all the time, that there is movement within each thing in seeming repose; and that since the process is veiled from perception the way to know it is to bring the thing into novel circumstances until change becomes evident. In short, the thing which is to be accepted and paid heed to is not what is originally given but that which emerges after the thing has been set under a great variety of circumstances in order to see how it behaves. Now this marks a much more general change in the human attitude than perhaps appears at first sight. It signifies nothing less than that the world or any part of it as it presents itself at a given time is accepted or acquiesced in only as _material_ for change. It is accepted precisely as the carpenter, say, accepts things as he finds them. If he took them as things to be observed and noted for their own sake, he never would be a carpenter. He would observe, describe, record the structures, forms and changes which things exhibit to him, and leave the matter there. If perchance some of the changes going on should present him with a shelter, so much the better. But what makes the carpenter a _builder_ is the fact that he notes things not just as objects in themselves, but with reference to what he wants to do to them and with them; to the end he has in mind. Fitness to effect certain special changes that he wishes to see accomplished is what concerns him in the wood and stones and iron which he observes. His attention is directed to the changes they undergo and the changes they make other things undergo so that he may select that combination of changes which will yield him his desired result. It is only by these processes of active manipulation of things in order to realize his purpose that he discovers what the properties of things are. If he foregoes his own purpose and in the name of a meek and humble subscription to things as they "really are" refuses to bend things as they "are" to his own purpose, he not only never achieves his purpose but he never learns what the things themselves are. They _are_ what they can do and what can be done with them,--things that can be found by deliberate trying.