2. Human Duality

Let us now observe from this standpoint the cooperation, the mutual interaction, between the blood and the nerves. If we consider the eye, we see that outer impressions act upon this organ. The impressions of colour and light act upon the optic nerve. So long as they affect the optic nerve, having for themselves an active instrument in the nerve-system, we are able to affirm that they have an effect upon the astral body. We may state that, at the moment when a connection takes place between the nerves and the blood, the parallel process which takes place in the soul is, that the manifold conceptions within the life of the soul come into connection with the ego. When, therefore, we consider this relationship between the nerves and the blood, we may represent by another sketch how that which streams in from outside through the nerves when we see an object, forms a certain connection with those courses of the blood which come into the neighbourhood of the optic nerve.