In "The Last Unicorn" by Peter S. Beagle, the quote "When you walk, you make an echo where they used to be" reflects the idea of memory and presence. It suggests that our movements and actions resonate in the spaces where others once existed, marking their absence while highlighting our own existence. This concept evokes a sense of nostalgia and connection to the past, emphasizing how the remnants of those who came before us linger in our lives.

Beagle's narrative explores themes of loss, longing, and the impact of those who have touched our lives. The echo symbolically represents the traces left behind by individuals who have influenced us, underscoring the deep connections we maintain with our history. As we navigate through life, the echoes serve as reminders of our relationships and experiences, shaping our identity and understanding of the world.