Jisho

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Wikipedia definition
1. Windowbox (film)Windowboxing (also called either the "postage stamp effect", "gutterboxing", or "matchboxing") in the display of film or video occurs when the aspect ratio of the media is such that the letterbox effect and pillarbox effect occur simultaneously. Sometimes, by accident or design, a standard ratio image is presented in the central portion of a letterbox picture (or vice versa), resulting in a black border all around.
Read “Windowbox (film)” on English Wikipedia
Read “額縁放送” on Japanese Wikipedia
Read “Windowbox (film)” on DBpedia

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