Backgrounds | Body | Boundaries | Defined | different | Ill | Importance | light | Obstruction | Opaque | Outlines | perspective | shadow | Supreme | Tone | Understood

Shadow is the obstruction of light. Shadows appear to me to be of supreme importance in perspective, because, without them opaque and solid bodies will be ill defined; that which is contained within their outlines and their boundaries themselves will be ill-understood unless they are shown against a background of a different tone from themselves.