Written in tiny faint letters on the top-left corner of Edvard Munch’s painting “The Scream,” is a mysterious inscription that reads, “Could only have been painted by a madman!” 

Experts have long debated the identity of the inscriber, with some suggesting a dissatisfied vandalizer is the author, while others pointed fingers at the Norwegian painter himself. Now, a new analysis finds that the mysterious phrase was almost undoubtedly inscribed in Munch’s handwriting.