https://phys.org/news/2018-07-wavy-clouds-edvard-munch-famous.html > "What's screaming is the sky and the person in the painting is putting his or her hands over their ears so they can't hear the scream," said Alan Robock, study co-author and distinguished professor in the Department of Environmental Sciences at Rutgers-New Brunswick. "If you read what Munch wrote, the sky was screaming blood and fire." > There are four known versions of The Scream: an 1893 tempera on cardboard; an 1893 crayon on cardboard; an 1895 pastel on cardboard that billionaire Leon Black bought for nearly $120 million at auction; and a tempera on hard cardboard thought to have been painted in 1910.