http://en.m.wikipedia.org/wiki/The_Scream

"One evening I was walking along a path, the city was on one side and the fjord below. I felt tired and ill. I stopped and looked out over the fjord—the sun was setting, and the clouds turning blood red. I sensed a scream passing through nature; it seemed to me that I heard the scream. I painted this picture, painted the clouds as actual blood. The color shrieked. This became The Scream."

http://www.artic.edu/aic/collections/exhibitions/Munch/resource/171