Anaglyph glasses are a "passive" form of 3-D, meaning they just filter out certain things naturally. One image is projected on a screen with a blue tint, and the other is projected in red.

“Some people in the research I did reported that the frequency of attacks was reduced by half to three-quarters when they regularly wore tinted glasses that blocked out much of the red and blue ...

By today’s 3D standards, the effect created by donning a pair of red and blue cardboard glasses is primitive ... expensive 3D goggles with electronic shutters. Each eye sees a slightly displaced ...