Unweaving the Rainbow This pleasure was not in spite of, but rather because he does not assume as cause the inexplicable actions of a deity but rather the understandable laws of nature. His starting point is John Keats' well-known, light-hearted accusation that Isaac Newton destroyed the poetry of the rainbow by 'reducing it to the prismatic colours.' Dawkins's agenda is to show the reader that science does not destroy, but rather discovers poetry in the patterns of nature. It is of little concern whether or not science can prove that the ultimate fate of the cosmos lacks purpose: we live our lives regardless
Rainbow as "blue" would today be regarded as cyan, and what Newton called "indigo" would today be considered blue. The colour pattern of a rainbow is different from a spectrum, and the colours are less saturated. There is spectral smearing in a rainbow owing to the fact that for any particular wavelength, there is a distribution of exit angles, rather than a single unvarying angle. In addition, a rainbow is a blurred version of the bow obtained from a point source, because the disk diameter of the sun (0.5°) cannot be neglected compared to the width of a rainbow (2°). The