The Figures of any Body will appear loosen'd from the Painting, and standing out with a great Relievo, when the Ground they are painted on is diversified with bright and obscure Colours; the greatest variety possible appearing about the Contours of the Figures: But it must be observed in distributing these Colours, that a due regard be had to their Degradation, that is, to the Diminution of brightness in the white, and of Obscurity in the Dark ones.