In following the two growth-principles, Goethe saw that the vertical comes to a halt in the blossom; the straight line here shrinks together, so to say, into a point, surviving only in the ovary and pistil as continuations of the plant's stalk. The spiral tendency, on the other hand, is to be found in the circle of the stamens arranged around these; the process which in the leaves strove outwards in spiral succession around a straight line is now telescoped on to a single plane. In other words, the vertical-spiral growth of the plant here separates into its two components. And when a pollen grain lands on a pistil and joins with the ovule prepared in the ovary, the two components are united again. Out of the now complete seed a new and complete plant can arise. Goethe understood that he would be taught a correct conception of this process only by the plant itself. Accordingly, he asked himself where else in the growing plant something like separation and reunion could be seen. This he found in the branching and reuniting of the veins in the leaves, known as anastomosis. In the dividing of the two growth-principles in the plant through the formation of carpel and pistil, on the one hand, and the pollen-bearing stamens on the other, and in their reunion through the coming together of the pollen with the seed, Goethe recognized a metamorphosis of the process of anastomosis at a higher level. His vision of it caused him to term it 'spiritual anastomosis'. Goethe held a lofty and comprehensive view of the significance of the male and female principles as spiritual opposites in the cosmos. Among the various manifestations of this polarity in earthly nature he found one, but one only, in the duality of the sexes as characteristic of man and animal. Nothing compelled him, therefore, to ascribe it in the same form to the plant. This enabled him to discover how the plant bore the same polarity in plant fashion. In the neighbourhood of Weimar, Goethe often watched a vine slinging its foliaged stem about the trunk and branches of an elm tree. In this impressive sight nature offered him a picture of 'the female and male, the one that needs and the one that gives, side by side in the vertical and spiral directions'. Thus his artist's eye clearly detected in the upward striving of the plant a decisively masculine principle, and in its spiral winding an equally definite feminine principle. Since in the normal plant both principles are inwardly connected, 'we can represent vegetation as a whole as being in a secret androgynous union from the root up. From this union, through the changes of growth, both systems break away into open polarity and so stand in decisive opposition to each other, only to unite again in a higher sense.'