Debates about building materials in architecture inevitably mention the term “truth to materials” (known in German as “Materialgerechtigkeit”). This refers to the suitability of a material in terms of its form and function. With John Ruskin and the Arts & Crafts Movement, truth to materials was even a moral obligation for authentic architecture. The discussion on material justice is determined by many aspects, the decisive ones being climate issues. Currently, the discussion on truth to materials is determined by many aspects, the decisive ones being climate issues. For this issue, the curators compiled recent projects made of timber, reinforced concrete, bricks, and Corten steel. And as varied as their materials and surfaces, as versatile are their construction solutions.