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We may expect by now that our eye is fitted with two modes of seeing activity, polar to each other, and that the way in which they come into operation depends on whether the interplay of positive and negative density outside the eye leads to the appearance of the blue-violet or of the yellow-red side of the colour-scale. Such a polarity in the activity of the eye can indeed be established.
His experiments were repeated by Morgan, Wollaston, and with far superior precision and diligence by Fraunhofer. The great Munich optician, whose work was completely original, rediscovered Melvill's deep yellow ray and measured its place in the colour-scale. It has since become well known as the "sodium line," and has played a very important part in the history of spectrum analysis.
Having thus established the connexion of the two poles of the colour-scale with the spherical and radial structure of space, we are now able to express the Goethean ur-phenomenon in a more dynamic way as follows: On the one hand, we see the blue of the heavens emerging when levity is drawn down by gravity from its primal invisibility into visible, spherical manifestation.
We shall start by observing what happens to the two sides of the colour-scale when the optical medium assumes various degrees of density. For the sky to appear blue by day a certain purity of the atmosphere is needed. The more veiled the atmosphere becomes the more the blue of the sky turns towards white; the purer and rarer the atmosphere, the deeper the blue, gradually approaching to black.
Then, as his senses quickened, the whole glorious colour-scale, from ashbud to whitethorn, stood revealed.
This shows that our visual ray is subject to entirely different dynamic effects at the two poles of the colour-scale.
If there is no prism we see simply a black shadow move into the illumined area on the screen, no matter from which side the narrowing comes. The same part of the light area may thus be made to display either the colours of the blue pole of the colour-scale, or those of the yellow pole.
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