3-D pictures in science

3-D is readily available-on the television and in the cinema. But in each case the 3-D technology is just a 'black box'. It is difficult to understand how it works, and it is of no value to know how it works. However, students can create their own 3-D images; and they can view these images without digital technology or hi-tech glasses. In doing so they can gain insight into binocular vision, and can enhance their understanding of the applications of lenses and mirrors. 3-D is a good starting point for the study of light and sight.