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For a narrow dark object on a light field is a much commoner occurrence in nature than the enclosing by two broad objects of a narrow space of light, the condition necessary for the emergence of a continuous colour-band with green in the middle.
There is, to begin with, the fact that the colour-band visible on the observation screen is only apparently confined to the surface of the screen. For, as we have seen, because of the differing co-ordination of levity and gravity at the two ends of the spectrum, the conditions of space prevailing at each are polarically opposite.
Faithful to his question, 'How does colour arise? Goethe now proceeded to investigate under what conditions two borders, when placed opposite each other, provide a continuous band of colour that is, a colour-band where, in place of the region of uncoloured light, green appears. In the case of an extremely narrow light-space, the blue and yellow edges will immediately overlap.
Further, the fact that on both occasions the darkness element in the colour-band increases in the outward direction tells us that in this direction there is on the blue-violet side a gradual decrease in positive, and increase in negative, density, while on the opposite side we find just the reverse.
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