The National Gallery (1968) by Mies Van der Rohe is based on the dematerialization of structure and the idealization of the grid and the horizontal slab. Although structure is expressed there, it is a metaphysical formalism that drives the work. In his Giatti Wool Mill (1951), Pier Luigi Nervi alters that paradigm. In this project, the distribution of material responds to local forces and relates to the vertical structural system. The structural articulation here is not merely about achieving higher performance but about the elegance of structural patternings which respond to force flows and material conditions in the world.