Stereographs showing the Smithsonian Institution’s touring cast of a plaster reconstructed skeleton of the horned dinosaur Triceratops. (The feet are actually casts of those of a hadrosaur, i.e., a very distantly related “duckbilled” dinosaur.) Above, the skeleton is seen as part of the Smithsonian display at the Pan American Exposition, Buffalo, NY (1901); below, (left) in the United States Government Building, World’s Fair, St. Louis (1904), and (right) again at the Pan American Exposition. To see these images in three dimenstions, just “reverse cross” your eyes.
