Designed by DeBoer Architects. The Gatehouse is not only curvy and dreamy in design, but also incorporates many sustainable design features. This one-bedroom passive solar straw-bale guest cottage features earth-plaster walls, radiant-heat floors stabilized with linseed oil, and a woven bamboo-mat ceiling with bamboo trim. While small in size, the open floor plan and rows of windows brighten the entire structure, making it appear more spacious.