As our observations have shown, gravity and levity not only exist side by side as a primary polarity; the manifold interaction of their fields gives rise to all sorts of secondary polarities. Obviously, this interaction must be brought about by a further kind of force to which gravity and levity are subordinate.

Firstly, by the way we have spoken of the varying relations of the sun and moon to the earth, seeing in them the effects of certain astral activities, we have treated them as if they were of like nature, namely, resulting from a movement of the relevant heavenly body round the earth. According to the Copernican conception, however, only the moon rotates round the earth, whereas the apparent yearly progression of the sun is actually caused by the earth's motion round the sun. This raises the question of how far the Copernican, heliocentric aspect is valid in a science which strives to embrace the astral realm of the universe in its inquiries.

In order that Form should come about, the forces of Saturn are required; for the formative process to take place in Wisdom-filled order, Jupiter's forces are necessary. If form and order are to become manifest in the realm of earthly substance, both require the assistance of Mars. We can best form an idea of the part which Mars contributes to the coming into being of the world of Form in nature if we observe what takes place when we make use of speech as a medium for expressing our thoughts. In order to be able to shape a thought we have to participate in the formative force of Saturn. We depend upon Jupiter to bring about logical connexion between the single thoughts. To announce them to the world, we need the motive force of Mars, which enables us so to set external matter in motion that it becomes a carrier and relayer of our thoughts. (We here touch upon the field of the acoustic movements of the air which will occupy us more closely later on.)

In order to make our experience of hearing a finger-post pointing the way to an understanding of the faculty of Inspiration innate in man, we must first of all seek to transform acoustics from a 'deaf into a 'hearing' science, just as Goethe turned the theory of colour from a colour-blind into a colour-seeing science.

Psychologically, the difference between ear and eye is that aural perceptions work much more directly on the human will - that is, on the part of our astral organization connected with the limb system. Whereas eye-impressions stimulate us in the first place to think, ear-impressions stimulate us to ... dance. The whole art of dancing, from its original sacred character up to its degenerate modern forms, is based upon the limb system being the recipient of acoustic impressions.

This opinion of Goethe's must surprise us in view of the fact that Kepler was the discoverer of the three laws called after him, one of which is supposed to have laid the foundation for Newton's mechanical conception of the universe. In what follows it will be shown how wrong it is to see in Kepler a forerunner of the mechanistic conception of the world; how near, in reality, his world-picture is to the one to which we are led by working along Goetheanistic lines; and how right therefore Goethe was in his judgment on Kepler.

By this last operation our equation has now achieved a form which requires only one more transformation to bring it into line with Newton's formula. Instead of writing:
r³ / t² = c
we write:
r / t² = c (1 / r²)
All that now remains to be done amounts to an amplification of this equation by the factor 4ϲm, and a gathering of the constant product 4ϲc under a new symbol, for which we choose the letter f. In this way we arrive at:
4ϲmr / t² = 4ϲcm / r²
and finally:
P = ... = fm / r²
which is the expression of the gravitational pull believed to be exerted by the sun on the various planetary bodies. Nothing can be said against this procedure from the point of view

In what follows we shall try, so far as is possible within the scope of this book, to throw light on the nature of this force. Since the direct experience of the dynamic realm constituted by it is based on faculties of the mind other than those needed for the Imaginative perception of the etheric realm, we shall have to examine also the nature and origin of these faculties. This will lead us again to the study of one of man's higher senses, this time his sense of hearing, with the aim of finding the spiritual function that is hidden in it. But our order of procedure will have to differ from the one followed in the last chapter, because it will be necessary first to make ourselves acquainted with the nature of the new force and then to turn to an examination of the sense-activity concerned.

Secondly, what roles do the other members of our planetary system play as compared with those of the sun and the moon?

Many examples of the activity of the force-spheres represented by the three exterior planets are to be found also in nature external to man. From the realm of plant life we may take the woody and bark-like formation of the trees as representing the operation of Saturn-forces. Similarly, all that goes on in the organizing of the single leaf, and particularly in the organization of the countless separate leaves which make up the foliage of a tree into a unified whole, the characteristic crown of a tree, is an example of the work of Jupiter. Both activities are assisted by the force of Mars, which directs them from the cosmic periphery toward the single physical object.