The Figures illuminated with some particular Light, show a greater Relievo, than those enlight'ned with an universal one. For a particular Light produces Reflex's, which loosen the Figures from the Ground of the Painting. These Reflex's rise from the Lights of some Figures, and Rebound upon the Shadows of those opposite to them, giving them a saint Light. A Figure however, exposed to a particular Light, in some vast obscure Place, receives no Reflex; so that there are no Parts of it to be seen, but what are enlightned: But this is never used, excepting in Night-Pieces, where the Light must be very dim and particular.