Junya Ishigami’s Zaishui Art Museum is conceived as a building that almost disappears into the lake it spans. A kilometre-long line of slender columns rises from the lakebed to hold a thin, gently undulating concrete roof, giving the impression that the structure has surfaced from underwater. Glass infill offers continuous views across the water, while intentional gaps at the floor edge let the lake flow inside, periodically submerging parts of the interior. In winter, the surface freezes while water continues to move beneath, allowing the building to register seasonal change. More landscape than object, the museum occupies a threshold between land and water, permanence and fluidity, turning the lake itself into a living architectural element.