Impressionism was an art movement developed in the late 1800s by artists such as Vincent van Gogh, Claude Monet, Alfred Sisley, and Edgar Degas. They painted mostly outdoor scenes of everyday life using short, thick brush strokes to capture mood rather than detail. Their paintings were done en plein air using wet-on-wet techniques and emphasized the play of natural light. Their innovative styles violated the rules of academic painting at the time.