In the 90s the Magic Eye became a hypnotic phenomena. In this picture here you can see a race car cross the finish line and more importantly you can see a flag being waved. If the 50s had the hoola hoop, and Rubik's cube was it in the 80s, then the Magic Eye was it of the 90s.
Does your brain have background OS? If you can see the flag here, they you do!