The term lenticular often refers to a printed image that shows depth or motion as the viewing angle changes. But in general lenticular is a term for the lens effect that creates a convex perspective of multiple images or light sources, but not necessarily a physical printed image. This lenticular technology can be used to create a lenticular image through the process of lenticular printing.Examples of lenticular printing include flip and animation effects such as the winking eyes that were given as the prize in Cracker Jack snack boxes to modern airport advertising graphics that change their message depending on the viewing angle. This technology was created in the 1940s but has evolved in recent years to show more motion and increased depth. Originally used mostly in novelty items, lenticular prints are now being used as a marketing tool to show products in motion.
I originally thought these were animated .gifs but they're apparently not. To see them in all their lenticulated glory, go here.