Parallel bars work in the same way to corner mounts and are perhaps more suited to a contemporary cover. Paper or card is held in place by two parallel bars, top and bottom, fixed to the inside front and inside back of the cover. Once more, you can display four or six sides retrospectively by adding extra hinges to the inside of the spine, or by using a wing and interscrew if you wish for the pages to be removable.
Opaque acetate sheets are also available if desired for protection against food and beverage spillages.
