he lustrous ceiling is supported on concrete columns whose tops swell into
broad caps resembling lily pads, prompting Wright to compare the space to a forest glade. Structural engineers were
skeptical of the designs integrity, however, and in a now-legendary episode
Wright loaded a test column with sand bags to demonstrate its ability to support the roof.
The natural metaphor is expanded in the Research Laboratory
Tower. Here, concrete floors recalling tree branches are cantilevered from a central shaft or trunk which
encloses the elevator and stairs, as well as mechanical services. Outside, the
Towers verticality acts as a dynamic foil to the Administration Buildings