provided a proper diminution of lights in the white tints, and of darkness in the shades, be judiciously observed.
Chap. CCLXVII.—Of Uniformity and Variety of Colours upon plain Surfaces.
The back-grounds of any flat surfaces which are uniform in colour and quantity of light, will never appear separated from each other; vice versâ, they will appear separated if they are of different colours or lights.
Chap. CCLXVIII.—Of Back-grounds suitable both to Shadows and Lights.
The shadows or lights which surround figures, or any other objects, will help the more to detach them the more they differ from the objects; that is, if a dark colour does not terminate upon another dark colour, but upon a very different one; as white, or partaking of white, but lowered, and approximated to the dark shade.
Chap. CCLXIX.—The apparent Variation of Colours, occasioned by the Contraste of the Ground upon which they are placed.
No colour appears uniform and equal in all its parts unless it terminate on a ground of the same colour. This is very apparent when a black terminates on a white ground, where the contraste of colour
