A little Light illumining a Body, occasions the Shadows on the unillumined side, to be large, and very bold in their extremes; as on the contrary, a large Light makes the Shadows on the same side of the Body, smaller and less distinct in their Bounds: When a little, but strong Light is inclosed in another more large, but more feeble withal, as the Sun in the Air, the weakest will in that case have the effect of a Shadow, on the Bodies illumined by it.