The late 1800s saw the emergence of a radical new school of painting known as Impressionism, dominated by Parisian artists. Their works represented the world around them, and they rejected classical subject matter in favor of modernism. They all shared a common interest in how light can define a moment in time, with color instead of black lines providing the definition. The Impressionists stressed the importance of painting outside, or “en plein air,” as a means of expression. Critics once dismissed Impressionism, but it has gained popularity and respect as one of the Western culture’s most significant art movements.