Among Colours more obscure than the Air, that will appear the most visible, which is seen at the greatest distance; and on the contrary, among those brighter than the Air, the furthest removed will be the dimmest and least distinct: Thus all things in general, may be said to change the Nature and Quality of their Colour, by being view'd from a great distance; the brightest in that case, appearing more obscure, and the dimmest more vivid.