From Kelsey Campbell-Dollaghan:

What all of these buildings have in common—from paraboloid concrete roofs of the 1960s to the gravity-defying arcs of the 2000s—is that they were spurred by major leaps in building technology. Engineering wonders like super-columns, extreme cantilevers, and steel exoskeletons have let us move beyond the phallus—a simple icon—into more complex shapes, which most of us identify as feminine.