But the old tradition of enclosed and contrasted inside space, which I want to analyze here, has been recognized by some Modern masters, even if it has not been much emphasized by the historians. Although Wright did in fact "destroy the box" in the Prairie House, the rounded corners and solid walls of the Johnson Wax Administration Building are analogous to the diagonal and rounded corners of Borromini's interiors and those of his eighteenth century followers- and for the same purpose: to exaggerate a sense of horizontal enclosure and to promote the separateness and unity of the interior space by the continuity of the four walls. But Wright, unlike Borromini, did not puncture his
continuous walls with windows. That would have weakened the bold contrast of horizontal enclosure and vertical openness. And it also would have been too traditional and structurally ambiguous for him.