The word "flap" in literature proves itself remarkably versatile, functioning as both a vivid verb and a tangible noun. It often conveys the graceful motion of wings, as in the depiction of birds returning to their nest with a gentle "flap, flap" ([1]), or the delicate beat of a creature soaring through the sky ([2], [3]). In other contexts, "flap" denotes physical objects like the open part of an envelope ([4], [5]) or even the worn edge of a jacket, suggesting decay and abandonment ([6]). It can also animate inanimate items—a tent’s flap signaling entry or exit ([7], [8]) or sails and banners fluttering in the wind as if imbued with life ([9], [10]). Overall, the term enriches narrative imagery by evoking movement, texture, and an inherent sense of transition.