Whether we understand it or not
Colour. Whether we understand it or not, there, undoubtedly, is nothing in this world left to chance alone, and nothing, I sincerely believe, is done by Nature without a purpose. The same merciful Providence that clothes the lambs with wool, the reason for which we can understand, paints the rose’s petal, the pigeon’s breast, or even the robin’s egg, for reasons which to us are inscrutable, or only to be vaguely guessed at. We can tell the “why” and the “wherefore” of the rainbow’s evanescent hues, but who shall investigate the laws that determine the fixed colours of the animal and vegetable creation? Who shall tell us why the grass is green, the rose is red, that bullfinch on the pear-tree so glorious in his gaudiness, and that sparrow so humble in his coat of brown?