The "Pisgah Handkerchief" is a 19th-century painting by Thomas Cole that is entirely blank. - Apparently.
This peculiar work of art was exhibited in 1838 at the National Academy of Design in New York City. It measures 24 inches by 36 inches and is a deliberate attempt by the artist to explore the concept of abstraction. Despite its lack of visual content, the painting is considered a significant work in the history of American art and is now housed at the New-York Historical Society.