Piranesi by Susanna Clark

Part of the fun is that this story is a puzzle. Maybe best to know as little as possible going in. Here are a few details:
Piranesi’s house is no ordinary building: rooms fill with the ocean's tides; its corridors are a labyrinth. But Piranesi is not afraid; he understands the ocean's tides as he understands the pattern of the labyrinth itself. He lives to explore the house. Winner of Women’s Prize for fiction 2021.