Inside A Streamlined Belgian Farmhouse. “You need these imperfections to surprise people, to make things not too predictable,” he says. “That's the essence of this project. Once you step inside, it's anything but a conventional farm house.” The pool house in a former barn features steel frames and original beams; the pool is sheathed with glass mosaic tiles, and the surround is Belgian bluestone. The texture of the walls against the smooth bluestone is a great effect.