Animated Autostereogram
Wall-eyed viewing is a perfect name to describe the technique of spotting the hidden 3D images in autostereograms. But to those who don’t understand this approach, looking at an animated Magic Eye picture can be a very good alternative.
Maybe this way is easier? Try to isolate one single point at the center of this animated picture using only your eyes, and you will immediately recognize the figure of a shark. The key is to see that one cohesive object is lying at the center of the image and NOT focusing on the countless little dots of static.