Marble Hornets is a documentary-style horror, suspense short film series based on alternate reality experiences of the
Slenderman tale. It follows the story and discoveries made by student filmers of the
Marble Hornets project, and has its basis in the tale before spinning off into an
alternate reality game (ARG), which are interactive narratives that use the real world as their playing field, bringing the "what if?" ideas that drive many other creators of fiction. The series tends to utilize the "This Is Not A Game" aesthetic, in which the world created by the game should be
as real as possible; therefore any location mentioned should be real, etc. Marble Hornets was instrumental in codifying parts of the Slender Man mythos, but is not part of the intercontinuity crossover that includes many of the blogs and vlogs that followed it, although MH does feature in other canons as either a chronicle of real events or a fictional series.
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