6. Tree of Knowledge II

Now you can conclude from this that the sense is, as it were, a thin zone, a thin outer zone of the physical, of what in fact works as the external world. You can indeed follow this with physical cognition: the eye can be looked on as a camera obscura, where the objects from outside create their images as in a photographic apparatus, and what is created within is then seized upon by the etheric body, astral body and ego. Thus we have a physical reciprocal action with the outer world which takes place in our periphery. And it is on this reciprocal action with the outer world that we first build up our soul process, insofar as the process is perception of the outer world and working-over of the perception in the soul.