Page:Drawing for Beginners.djvu/180

 sometimes notice the long shadows cast by a stone, the flickering ribbon of shade thrown across its path when the sun is low on the horizon.

By comparing diagrams of sun and shade you can make your own deductions.

''The sun is so far removed from the earth's surface that its rays are parallel. But the rays from lamp or candle radiate on all sides and cannot be considered parallel.''