Answer:
It provides a “single powerful spectacle” for the imagination’s eye.
Step-by-step explanation:
According to the excerpt the concept that best relates is "single powerful spectacle". In Danse Macabre, King states that "The imagination is an eye, a marvelous third eye that floats free ... The job of the fantasy writer, or the horror writer, is to bust the walk of that tunnel vision wide for a little while; to provide a single powerful spectacle for the third eye". This is precisely what the author of the fragment tries to create; an incentive in the reader to imagine what could cause the sound in the window and thus generate the intrigue typical of horror literature.