1936: A New Jersey gallery hangs Phantasy by Spencer Nichols upside down. The gallery remarks that it is an abstract work. Nichols replied that it depicts a seascape, and only appears to be abstract when it is hung upside down.
1961: The Museum of Modern Art hangs Le Bateau by Henri Matisse upside down. A stock broker noticed the error and pointed it out, but the museum officials were adamant that it was hung properly.
1965: The National Gallery in London hangs Grass and Butterflies by Vincent van Gogh upside down. They had reproduced the work, oriented correctly, in the exhibition catalog.
1979-1989: The Wadsworth Anthneum in Connecticut hangs The Lawrence Tree by Georgia O’Keefe upside down. O'Keefe protested this error for years, and it was only after the work was part of a travelling exhibition that a researcher discovered this persistent mistake and the Wadsworth corrected it.