Cantilevered structures, acute angles, illuminated plastic paneling, freeform boomerang and artist's palette shapes and cutouts, and tailfins on buildings marked Googie architecture, which was contemptible to some architects of then-current High Art Modernism, but had defenders during the post-Modern period at the end of the 20th century.
Roofs sloping at an upward angle: This is the one particular element in which architects were creating a unique structure.