There are two-way mirrors which allow you innocently to spy on people. This is one of the finest metaphors for consciousness. There is no two-way screen because there is nothing to see on the other sice of the screen, nothing to see without bein seen. Jean Baudrillard.
Civilization and Other Chimeras Observed during the Making of an Exceptionally Artistic Feature Film, an interesting essay-film, inspired by Jean Baudrillard by Aryan Kaganov (2009). Read an analysis of the film (in Dutch) by Theodor Steen on Salon Indien.