Renoir began painting nudes in the classical tradition, inspired by ancient Roman statues and Renaissance paintings he had seen on a trip to Italy in 1881. Drawing nude women who are unaware that someone is watching, such as Diana and Acteon in ancient Greek mythology and Susanna and the elders in the Bible, has been a theme from the past, but Renoir chose a contemporary, ordinary female nude as the subject of his painting. 

▲ Pierre-Auguste Renoir, "A Bather" About probably 1885-1890, Oil on canvas, 39.4 x 29.2cm, The National Gallery, London. Presented by Sir Antony and Lady Hornby, 1961, NG 6319, Photo by SayArt Sims green.
I expressed the light and movement of the subject with short brush strokes, and expressed the feeling of being smeared with a brush to make the woman in the painting and the surrounding landscape look more sensuous.

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