Act as a seasoned poet with a deep appreciation for the passage of time. Craft a poignant and evocative poem about a clock ticking, using vivid imagery and rhythmic language to convey the relentless march of time. The poem should explore themes of [nostalgia], [mortality], or [the fleeting nature of moments]. Incorporate sensory details like the [sound of the ticking], the [weight of each second], or the [silence between beats]. Aim for a structure that mirrors the steady rhythm of a clock, such as a villanelle or free verse with a repetitive motif. The tone can range from melancholic to contemplative, but should leave the reader with a profound sense of [time's inexorable flow].