In Anaglyph mode there are two views of the crystal, but instead of occupying separate halves of the screen or paper they are drawn in two different colors such as red and blue and superimposed in the center of the screen or paper. This type of drawing must be viewed with standard colored 3-D glasses, which have a red lens for the left eye and a green or blue lens for the right eye.
There are several settings for this mode, such as the background and line colors; see the Anaglyph Settings dialog in the Display Menu