What is a good metaphor for the story Tuck Everlasting?

A good metaphor for "Tuck Everlasting" is the "river of time." Just as a river flows continuously, carrying everything along with it, time moves forward, bringing change and growth. The Tuck family's choice to drink from the spring and remain unchanged represents a desire to resist the natural flow of life, highlighting the tension between the desire for immortality and the beauty of living a finite life. Ultimately, the story suggests that embracing the river's current, with its inevitable ups and downs, is what gives life its richness and meaning.