I created these poster display mounts in the tall exhibit cases, since we didn't want to put them on the wall (where they'd be unsecured) and we wanted to showcase as many posters as possible. It's two pieces of Vyvek plastic, notched at the center, and supported by a base of several layers of matboard with a groove cut into it to hold the plastic. Magnets then hold the posters to the plastic, allowing eight posters for each display.
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