Stereograph, "Morehouse's Comet," 1908

Americans loved stereographs -- millions were made from the mid-1800s through the 1930s. A stereograph consists of two offset photos that appear to have three-dimensional depth when viewed through a stereoscope. These images entertained and educated. Stereographs could transport viewers to distant events, exotic places, and even worlds beyond, like this image of a comet first seen in 1908 and named for astronomer Daniel Morehouse.