Explain the time period and origins of expressionism. Highlight how Expressionist artists felt estranged from their society. For example, many Expressionists were located in 19th-cenutry Germany. The German society was changing and modernizing and not in all good ways. Expressionists set out to show what they thought the world was like, not the literal picture they saw around them.
Define the hallmarks of Expressionism. Explain that these include exaggerated images--larger or smaller than real-life objects--distorted colors and fantasy, using images that cannot exist in reality.
Show examples of famous Expressionist works. Use "The Scream" first. Explain that this portrait includes all the Expressionist hallmarks: The man's mouth is exaggerated and long. The colors in the background are swirled together and distorted. And all of this suggests a degree of fantasy. Next show "View of Toledo" and "Rehe im Walde."