η. The main endeavour of Bruno was thus to represent the All and One, after the method of Lullus, as a system of classes of regular determinations. Hence in the manner of Proclus he specifies the three spheres: First, the original form (ὑπερουσία) as the originator of all forms; secondly, the physical world, which impresses the traces of the Ideas on the surface of matter, and multiplies the original picture in countless mirrors set face to face; thirdly, the form of the rational world, which individualizes numerically for the senses the shadows of the Ideas, brings them into one, and raises them to general conceptions for the understanding. The moments of the original form itself are termed Being, goodness (nature or life), and unity. (Something similar to this we also met with in Proclus, Vol. II. p. 445) In the metaphysical world the original form is thing, good, principle of plurality (_ante multa_); in the physical world it manifests itself in things, goods, individuals; in the rational world of knowledge it is derived from things, goods and individuals.[89] Unity is the agent that brings them back once more; and Bruno, while distinguishing the natural and metaphysical world, seeks to set up the system of the above determinations, in order to show at once how the same thing is in one way a natural appearance, and in another way an object existing for thought. Since Bruno sought to apprehend this connection more closely, he considers thinking as a subjective art and activity of the soul, representing inwardly and in accordance with the ordinary conception, as it were through an inward writing, what Nature represents externally, as it were, through an outward writing. Thinking, he says, is the capability both of receiving into one’s self this external writing of nature and of imagining and substantiating the inward writing in the outward. This art of thinking inwardly and organizing outwardly in accordance with the same, and the capacity to reverse the process—an art possessed by the soul of man—Bruno places in the closest connection with the art of the nature of the universe, with the energy of the absolute World-principle, by means of which all is formed and fashioned. It is one form which develops; it is the same world-principle which causes form in metals, plants and animals, and which in man thinks and organizes outside himself, only that it expresses itself in its operations in an endlessly varied manner throughout the entire world. Inwardly and outwardly there is consequently one and the same development of one and the same principle.[90]