Swiss architect Valerio Olgiati treats concrete as the one material that gives a building its unity. Cast in place and pigmented through the mix, his monoliths — Plantahof Auditorium, Atelier Bardill, Villa Além — read as single continuous bodies, floor to ceiling, with no ornament and sharp openings.

This system distills that austerity into an interface: a cool, uniform monolithic-concrete gray as the ground, matte and orthogonal, broken only by the single deliberate rust-red of the pigmented cement Olgiati used to harmonise with the rusty earth.