5.1 Describe the ways in which artists use light to represent space and model form. The "rules" of atmospheric, or aerial, perspective state that an object’s appearance changes depending on how much atmosphere lies between it and the person viewing it. Objects that lie further away from the viewer appear less distinct, are generally bluer in color, and have decreased contrast between lights and darks. How does atmospheric perspective differ from linear perspective? How does J. M. W. Turner uses atmospheric perspective in his painting Rain, Steam, and Speed—The Great Western Railway?