This is a light box / marquee insert for the 1998 Fox film The X-Files
Top layer is thin transparency film that is blackened out everyone except where the imagery goes. Behind the transparency is translucent colored paper that adds the color to the transparent sections of the top layer. We’re not 100% sure how this particular pieces was used in the theater, but after talking with friends that used to work at theaters, they say it would have likely been used over the theater door or at the ticket counter before those all went to digital displays.
Piece is in great condition with light surface scuffing from age and storage. Measure 12.75″ by 5″. See photos details.