"Morphology rests on the conviction that everything that exists must signify and reveal itself. From the first physical and chemical elements to the spiritual expression of man we find this principle to hold. We turn immediately to that which has form. The inorganic, the vegetative, the animal, the human. Each one signifies itself, each one appears as what it is to our external and our internal sense. Form is something changeable, something becoming, something passing. The doctrine of metamorphosis is the key to all of the signs of nature."