Exterior, House Building Type, and Metal Siding Material The structure is clad in weathered steel with an interior of concrete and untreated oak window frames. Tonko's design is meant to be what he describes as a "delicate workshop," an easy-to-clean, distraction-free space that allow for concentration and creativity.  Photo 3 of 7 in Camera-Inspired Artist's Studio Offers Stunning, Wide-Angle Views