The word “containing” is frequently used in literature to indicate that one object, text, or idea holds or comprises something else—a concept that spans both the literal and metaphorical. In physical descriptions, for instance, it may denote an envelope with a white feather [1] or a tin trunk holding new possessions [2]. In literary titles or chapter headings, “containing” signals that the following text comprises specific content, as seen in chapter introductions that note “containing little or nothing” [3] or declarations such as “Containing a very surprizing adventure indeed” [4]. Its use extends into instructional and grammatical contexts too, where phrases like “Write five sentences containing descriptive adjectives” [5] highlight its function as a modifier that links an object with its attributes. Thus, whether delving into detailed scientific accounts [6] or establishing allegorical layers in narrative works [7], the term “containing” consistently serves to bridge and define the relationship between a container and its contents.