Take a few moments to look at these paintings by Joseph Mallord William Turner (aka J.M.W. Turner aka William Turner). While the subjects are important, what I wish to point out is the techniques used, and how Turner’s approach to light evolved. When looking at these paintings, focus on the approach the artist took to convey his ideas, and how that translated into technique.
Looking into his catalog of work, the evolution is just as clear. By the time he reached near the end of his light, Turner was experimenting, not just with light, but with how the light was conveyed on the canvas, and how the approach used could alter the scene or event being painted. What makes Rain, Steam, and Speed, The Great Western Railway so intriguing to me, is not just the technique, but how it relates to the artist and his previous works. Early on, he followed tradition. By the end, he was painting almost nondescript scenes, with areas left clouded or ambiguous, and only a few items on the canvas that could be recognizable. He was pushing and exceeded traditional boundaries that had been taught in the art academies.