From the Dr. Seuss Stationery and Accessory Collection. Dr. Seuss Hologram Bookmarks. Assortment contains 5 different Dr. Seuss Hologram bookmarks featuring your favorite characters from Cat in the Hat, Green Eggs and Ham, Horton Hears a Who and more! Each bookmark features 3 images that change when positioned at different angles. Change image from one screen to the next by angling bookmark. Measures 2.5" wide x 3.5" tall.