Architect Robert Gurney designs a simple light-filled cubiform house in Bethesda, Maryland. Architect Robert Gurney and his client, a young entrepreneur with a large family, shocked the residents of the Edgemoor section of Bethesda, Maryland, with the house they created. It was not because of the design's Modernist roots, although the house is decidedly unlike the Colonial- and Craftsman-style ones nearby. The surprise comes from its size. At just 2,200 square feet, the house is dwarfed by its stately, overscaled neighbors. 'Most of the new houses in the neighborhood are being built to the maximum size allowed by the zoning,'