The proposal to convert the former municipal spa into a library represents an opportunity to address modern architectural challenges, such as reusing historical heritage and reducing environmental impact. The design highlights the existing architectural qualities, transforming the iconic swimming pool hall into a welcoming library. In remembrance of its past as a municipal spa, the lighting design aims to recreate effects that evoke the concept of water. The building's volume remains unchanged, saving public resources and minimizing environmental impact. Targeted structural interventions create impressive entrances, while the renovated glass facades promote community engagement, integrating the library into the heart of Chomutov. This conversion reflects the evolution of architecture and society, bringing life back to an abandoned building for future generations.