Closer inspection into the connexion of the two visual activities of the eye with its basic corporeal parts reveals that here, at the outermost boundary of the human organism, we encounter once more that peculiar reversal of functions which we have already several times met in various realms of nature. For the anterior part of the eye – its salt-pole – which has come into being through a spherically directed formative process, seems to be the one through which we exercise the perceptive activity streaming out radially from the eye, whilst the posterior part – the eye’s sulphur-pole – which has come into being through radially directed formative action, serves that form of seeing which is more receptive and is carried out in a plane-wise manner.