Within the time period described, cave paintings were an early form of visual art and entertainment. Shadow puppets then emerged using parchment to tell stories through articulated figures. Early animation devices like the phenakistoscope, zoetrope, and flip book used sequential images to create the illusion of movement. Important pioneers like Eadweard Muybridge performed early experiments in stop motion photography. Advances like sound, color, computer animation, and CGI gradually transformed animation into a mainstream form of digital media entertainment.