Stereo (ANAGLYPH): the two images overlap, resulting in three-dimensional effect, when viewers put on stereoscopic glasses when viewing immersive feel. Also known as "3D stereo".
Movies are human eyes angle difference and convergence capabilities can produce stereoscopic effect of making movies. Appeared in 1922. This two images superimposed on the screen when the film through special glasses or in front of the audience radiating half tapered optical grating, that left the audience saw pictures taken from a left perspective, see pictures taken from the perspective of the right of the right eye, through the eyes of convergent function into stereoscopic images.