6C Sam L. Gabriel & Sons & Co. New York, 1924. No. 878. With Color Wonder Spectacles. 

Notes

The Wonderspex Animal Book is a triumphant milestone of early 20th-century interactive children's publishing, operating as a precursor to modern 3D and anaglyph storytelling. The book features an array of detailed illustrations of wild and domestic animals—including lions, elephants, bears, and birds—printed using a highly specific, overlapping dual-color printing technique. To the naked eye, the pages present a chaotic, seemingly jumbled overlapping of red and blue/green ink lines. However, when viewed through the included "Wonder Spectacles," the optical filters isolate the individual colors. This creates a brilliant, magical transformation where the animals instantly pop into sharp, distinct relief, or appear to shifting dynamically on the page as the child closes one eye at a time. Accompanied by simple, charming nursery rhymes and natural history trivia, the book converted basic reading into an immersive, technological game of optical discovery.