The Impressionist movement began in the 1870s as artists rebelled against rigid academic painting standards. They started independent exhibitions to show their unfinished, spontaneous works which emphasized capturing fleeting moments and effects of light. Art critic Louis Leroy coined the term "Impressionism" after Monet's painting Impression, Sunrise. Key Impressionist techniques included painting outdoors, using loose brushstrokes and bright colors, and focusing on modern life subjects. Famous Impressionists like Monet, Renoir, Degas, Pissarro and Sisley developed these techniques to depict the optical effects of light and convey changing atmospheres. Their work marked a shift to a more modern style of painting.