Single-Sided / Double-Sided

Before 1988, when lightboxes became popular for theater lobby display of one sheets, posters were single-sided. . The lightboxes wash out the image on single-sided posters, so double-sided posters, with the image re-enforced by being reprinted on reverse, came into use. Early double-sided posters are considered desirable because 1) far fewer were produced in the early days of the format and 2) they are much more difficult to reproduce, although there are a few examples of double-sided reproductions.