The author spent the summer at Recurse Center, a programming retreat in Brooklyn, where they participated in various study groups and activities. They joined groups such as Agentic Adventures, which explored modern LLMs and agents, and Practical Deep Learning, where they worked through a book on machine learning and neural networks. The author also co-founded a math discussion group, Math Monday, with a fellow participant, which involved learning and exploring mathematical topics. Additionally, they participated in other groups, including one investigating an open-source board game AI, and worked through old Advent of Code challenges with others. Overall, the author's experience at Recurse Center was focused on learning, exploring, and discussing various programming and mathematical topics with like-minded individuals.