Readers know that Finch regularly considers suicide, so it’s especially significant that Finch seems to seek out “the small things” and “lovely” places like the Purina Tower. He seems to be trying to convince himself of what he’s telling Violet: that life is worth living, and that there are many things in life that are worth celebrating. The idea of “built-in endings,” meanwhile, offers Violet and Finch a framework to think about their identities. Everything in their lives—including aspects of their identities—might change or disappear at some point, and that’s normal and expected.