A single and distinct luminous body causes stronger relief in the objects than a diffused light; as may be seen by comparing one side of a landscape illuminated by the sun, and one overshadowed by clouds, and illuminated only by the diffused light of the atmosphere.

To any white body receiving the light from the sun, or the air, the shadows will be of a bluish cast.

Beauty perishes in life, but is immortal in art.

Vitality and beauty are gifts of Nature for those who live according to its laws.

Darkness is absence of light. Shadow is diminution of light.

The eye encompasses the beauty of the whole world.