The Bruder Klaus Field Chapel by Peter Zumthor is a small concrete chapel near Wachendorf, Germany. Its interior is a scorched charcoal-black cavity: 112 tree trunks were stacked as formwork, rammed concrete was cast around them, then the timber was burned out, leaving a ribbed, sooty void lit by a single open oculus.

This design system distills that charred interior — near-black walls with warm sooty browns in the ribbing, a single warm light shaft, and hand-blown glass studs glowing against the dark. Austere modern grotesque sans throughout, no ornament, no decoration.