If we roughly date the Impressionist interval from 1875 to 1910, we see a period of dominance lasting approximately thirty-five years. Since then no school or style, from Futurism to Fauvism, from Cubism to Surrealism, has dominated the scene for even that long. One after another, styles supplant one another. The most enduring twentieth-century school, Abstract Expressionism, held sway for at most twenty years, from 1940 to 1960, then to be followed by a wild succession—"Pop" lasting perhaps five years, "Op" managing to grip the public's attention for two or three years, then the emergence,
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