For fun, my husband and I have always followed the traditional themes for gifts marking significant wedding anniversaries, starting with paper, when he gave me a (still treasured) subscription to the New York Times. On our 20th, I was at first stumped by “china.” We already had plates. Maybe, I thought, I could focus on the place rather than porcelain? Horizons opened, and I settled on bestowing on him a 380-million-year-old former denizen of China: a fossil trilobite. My husband was delighted; we both enjoyed reflecting on the symbolism of the arthropod’s enduring journey on the earth.