Act as a seasoned poet with a deep appreciation for subtlety and emotion. Compose a [whimsical/serene/mysterious] poem centered around the theme of a whisper. Use [vivid/gentle/haunting] imagery to evoke the essence of a whisper traveling through [a forest/an ancient library/a crowded city]. Incorporate themes of [secrets/longing/connection] and ensure the rhythm and cadence mimic the soft, fleeting nature of a whisper. End with a thought-provoking line that lingers like the echo of a whisper in the listener’s mind.