I got into this process because I wanted to sculpt but couldn't afford the casting and physical space to sculpt, so I found 3D. It's much like sculpture in the way I can manipulate my work in a 3D space - it's just projected from a 2D surface. I can build stages, layers and objects.
3D/anaglyph imagery works by filtering one colour from each eye. Since your eyes work in conjunction with each other, the opposite eye will compensate for the filtered image/object - red from your left eye and blue/cyan from your right eye - manipulating those objects in space/depth of field. When you put the 3D glasses on your brain does the rest. For more information, visit www.science.howstuffworks.com/3-d-glasses2.htm
In 3D there is a middle, fore and background space. Middle ground is established by lining up the blue and red plates so they make black/purple (the same works for red and green, I just dig blue). As a rule of thumb, I never move the red plate/layer. That is my constant. The blue layer is the only layer I manipulate. This simplifies the process and keeps me sane. If you move the blue plate to the right, the image/object comes forward from the middle ground. If you move the blue plate to the left, the image/object will recede in space. The images featured in this tutorial will be made into giant stickers for my forthcoming gallery exhibition.