At the Bruder Klaus Field Chapel, designed by Peter Zumthor, the construction process involved the direct participation of residents from the small Swiss village of Mechernich. Using an internal formwork made of vertically placed wooden logs, concrete was prepared in small batches and poured manually, day after day, forming layers marked by subtle variations in the mix and application. At the end of the process, the wooden structure was reduced to ashes, leaving the chapel's interior impregnated with traces of fire and revealing a dark, tactile surface. The result was a quiet and deeply meaningful space, where collective action, time, and material transformation became part of the architecture. Centered on locally available resources and manual techniques, this construction method highlights how the choice of materials and building system can shape the experience of a space, reveal the time invested, and embed the culture of a place into the very matter of architecture. In doing so, it offers an example of how construction itself can become a regenerative act, restoring meaning, connecting communities, and honoring material cycles.