Exterior, Metal Siding Material, and House Building Type Welded-sheet steel partitions both carve out a sleeping area and mirror the exterior palette, blurring boundaries between inside and outside. Inspired by the hue of artist Richard Serra’s Cor-Ten sculptures, the Lowreys had all of the steel primed and painted with a hand-mixed blend of matte paint from Sherwin-Williams.  Photo 9 of 14 in These Separate Studios Keep a Retired Couple Happy