Cat
The domestic cat possesses remarkable physical resilience, with an average lifespan of 12 to 18 years under appropriate care. Cats survive falls, recover from injuries, and demonstrate considerable resistance to environmental stressors. However, they require constant biological maintenance: feeding, hydration, veterinary care, and eventual replacement as mortality claims its inevitable due. The cat is, fundamentally, a temporary resident of any household, no matter how beloved its tenure.
Mirror
A well-maintained mirror may persist for centuries without degradation of function. The silvered glass requires only occasional cleaning and protection from impact. Mirrors from the 17th century remain in perfect working order, reflecting faces that have not existed for three hundred years. The mirror does not age, does not tire, and does not require sustenance. Its only vulnerabilities are physical damage and obsolescence through replacement—neither of which the mirror itself can perceive or regret. In durability terms, the mirror outlasts not merely individual cats but entire feline lineages.