is a discipline intent on creating stereoscopic images by means of (opposite) chromatic filtration, typically, red and cyan (or sometimes blue) or orange and green. By applying these “layering” of filters the visual cortex is “tricked” to perceive such images as being three dimensional when viewed aided with stereoscopic glasses.
All images are best viewed with a pair of 3D glasses. My personal aim, ‘though, is to render all my images appreciable with or without such implements.
And try not to strain your eyes too much by staring at the monitor for too long.