![In keeping with Scandinavian building traditions, locally sourced Douglas fir clads the exterior. "The clients like the simplicity of [local] barns," Koolhaas says. The black paint also helps draw in heat, which is important in the region's cold climate. Photo 2 of 8 in Triangular House by Laura C. Mallonee](https://images2.dwell.com/photos/6063391372700811264/6133559819018940416/original.jpg?auto=format&q=35&w=160)
Triangular House
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In keeping with Scandinavian building traditions, locally sourced Douglas fir clads the exterior. "The clients like the simplicity of [local] barns," Koolhaas says. The black paint also helps draw in heat, which is important in the region's cold climate.