The keyword phrase "september 11th wallpaper" functions grammatically as a compound noun. The main point, or head noun, is "wallpaper," which is modified by the preceding words.
In this construction, the proper noun phrase "September 11th" acts as a noun adjunct (or attributive noun). Its role is adjectival, modifying the primary noun "wallpaper" by specifying its theme or subject matter. The phrase "September 11th" denotes the specific historical event, and its placement before "wallpaper" transforms it into a descriptor that categorizes the type of digital background being referenced.
Therefore, for the purpose of an article, the central subject is the tangible or digital object: the "wallpaper." The modifier "September 11th" provides the crucial context, indicating that the article should focus on digital images created for use as backgrounds that commemorate, remember, or are thematically linked to the events of September 11, 2001. The analysis establishes that the core topic is a form of media, not the historical event itself.
