Stereoscopic 3D occurs when each eye is seeing a difference image, the same way our eyes function everyday, which can be achieved through different colored films (anagylph 3D), the use of a silver screen and polarizing filters (passive stereoscopic 3D), or by using active 3D Glasses with a DLP projector (active stereoscopic 3D). Here at AVRover we are big proponents of active stereoscopic 3D for a number of reasons. First of all active stereoscopic 3D lends itself best to portable applications, since only one projector is required and no silver screen is needed. Secondly, it is very high quality 3D, many agree that is it more rich and more easily visible than passive stereoscopic 3D. Thirdly, Cost! It is the most cost effective stereoscopic 3D option, which enables us to provide this incredible technology at a significant discount over other stereoscopic 3D providers. This may seem counter-intuitive because active 3D glasses cost much more than passive glasses containing polarized lenses that can be made of cheap plastic or even paper but consider this: a passive 3D solution typically requires 2 projectors, not 1, in addition to a silver screen as well as the polarizing filters. Plus when using a silver screen you typically want to have a higher lumens projector because there is a loss of brightness, especially in terms the darker colors, which can appear washed out. When you look at these factors it is clear that Active 3D, which has been endorsed by the AOA (American Optometric Association) as the preferred Stereoscopic 3D method for use in education, is still the best way to bring the stereoscopic 3D experience to the classroom.