What Impressionism Sought to AchieveBy the year 1863 the sentry which allows the visual messages transmitted by the eye to penetrate to the brain only after a rigorous censorship, had admitted most aspects of visual truth, but there were two that had not yet officially passed the censor. They were (1) the colour and vibration of light and (2) the density of air. No one had ever painted the true colour of sunshine and shadow, and hardly anyone had thought it worthwhile to suggest that the density of the air is not always constant, that a picture could be painted, for instance, of a landscape seen through a heavy mist or fog.But both these visual discoveries were, fundamentally, subheadings of a larger discovery. What the Impressionists did, almost without knowing it, was to realize the phenomenon of transitoriness. The artist who carries his canvas out into the open air and attempts to record every nuance of what his eye sees is in a very different frame of mind from the artist who constructs his picture in his studio from a series of preparatory sketches or studies. His eye may not be more searching but it becomes conscious of a different set of visual data. He becomes less and less concerned with the nature of the object figure or landscape-he happens to be painting, and more and more conscious of the appearance of the object at a particular moment of time.For Monet, at work on a picture of Rouen Cathedral, what his eyes encountered was not a Gothic structure but an envelope of air of a certain density through which the Cathedral could be seen and by which its appearance was modified with every shift of light. For him, therefore, his very subject matter was altering its nature at each hour of the day. Since, therefore, the emphasis in every Impressionist painting, is on the moment of time, it was natural that the Impressionists should deliberately seek out momentary effects. In a painting by Monet of the entrance to the Gare St Lazare, the most arresting features are not the iron bridge and the building behind it, but the steam that drifts under the bridge and the locomotive, deliberately placed on the extreme left in order to give the impression that it is on its way out of the picture.Such selected moments in time are the keynote of those landscapes by Monet, Pissaro, Sisley and in which one is always aware of the time of day, the season of the year, the precise strength of sunlight or the density of the atmosphere, AND also of the figure compositions of Degas and the later work of Monet, in which the true ' subject ' of the painting is the sudden turn of the head of a waitress in a cafe , the momentary gesture of a dancer or a woman ironing or trying on a hat in a milliner's shop. These problems were tackled by Claude Monet and Camille Pissarro to the exclusion of a great many of the qualities which previous artists had considered essential.The Impressionism movement furnishes the clearest instance in the history of art of a new visual discovery, made in a spirit of pure research, which produced in the long run a new kind of beauty. In its purest form it painted solely what the eye saw. "Monet is only an eye. But what an eye! "said Cezanne, inadvertently capturing the virtues and weaknesses of the whole school.
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