is true also of particular forms or of particular modes of matter. Substance is a necessity for the expression of Spirit, but it does not follow that Spirit is tied down to any particular mode of expression. If you fold a piece of paper into the form of a dart it will fly through the air by the law of the form which you have given it. Again, if you take the same bit of paper and fold it into the shape of a boat it will float on water by the law of the new form that you have given it. The thing formed will act in accordance with the form given it, and the same paper can be folded into different forms; but if there were no paper you could put it into any shape at all. The dart and the boat are both real so long as you retain the paper in either of those shapes; but this does not alter the fact that you can change the shapes, though your power to do so depends on the existence of the paper. This is a rough analogy of the relation between ultimate substance and particular forms, and shows us that neither substance nor shape is an illusion; both are essential to the manifestation of Spirit, only by the nature of the Creative Process the Spirit has power to determine what shape substance shall take at any particular time.