'Mare Humorum' Matted Trouvelot PrintPlate VI. Mare Humorum. From a Study made in 1875. The luminous illustration on this print is reproduced from one of tienne Lopold Trouvelot's original lithographs, a selection of which are on display at the Museum of Jurassic Technology as part of the exhibit, Scrupulous Fidelity: The Astrophysical Illustration of tienne Lopold Trouvelot. The image, which measures approximately 7 x 10 inches, is printed on lightly textured, archival quality velvet