I loved his idea that the sink & cooktop can be concealed entirely in the cabinetry by folding over two hinged countertop pieces. Johnson and Whitney entertained countless art & cultural world luminaries there so this option probably came in handy.
I guess more storage was needed at some point since the second set of cabinets, shown at right, are not shown on the original plans. They are darker grey fronts with a bluestone countertop instead, but still feel like part of the whole there and actually add visual interest. In fact, many kitchens today are designed to mix materials just like this from the beginning.