A lightbox (light box) refers to an encased frame (or box) for a movie poster that is lit from behind. They're generally best suited for double-sided posters.
There are many different types of lightboxes available for your movie poster. You want to be sure that you choose one that looks good and also one that will fit on your wall.
Another thing to consider is that light is an enemy of movie posters - they damage them slightly over time. So, if you're concerned about the value of your movie poster deteriorating over time, lightboxes might not be the best way to show/store your collection.
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