make darker or lighter shadows, which you must compare with your own.
559.
OF SURROUNDING BODIES BY VARIOUS FORMS OF SHADOW.
Take care that the shadows cast upon the surface of the bodies by different objects must undulate according to the various curves of the limbs which cast the shadows, and of the objects on which they are cast.
The juxtaposition of light and shade (560, 561).
560.
ON PAINTING.
The comparison of the various qualities of shadows and lights not infrequently seems ambiguous and confused to the painter who desires to imitate and copy the objects he sees. The reason is this: If you see a white drapery side by side with a black one, that part of the white drapery which lies against the black one will certainly look much whiter than the part which lies against something whiter than itself. [Footnote: It is evident from this that so