The project is a third level addition and extensive renovation to an existing two level single-family residence in San Francisco. The function of the top floor is for a Private Art Gallery, with a new Master Suite considered as an integrated extension of this space. The addition is approximately 1,200 sq. ft., and is constrained by existing structural walls and neighboring structures. With the need to maximize vertical wall surfaces for art, the design emphasizes the ceiling plane with a pattern of optically shifting grooves. Sheathing the entire top floor ceiling and rear wall, this lining unifies the spaces and is in contrast with the architectural neutrality of the smooth walls. An entry gate is perforated with a security warning written in binary code text.