What material does Niemeyer primarily use to demonstrate sculptural potential in his architecture?

Niemeyer primarily uses concrete to demonstrate sculptural potential in his architecture because this material allows for fluid, organic forms that reflect the natural landscape. Concrete can be molded and shaped into various forms, giving Niemeyer the freedom to create sweeping curves and unconventional structures that are a hallmark of his design philosophy. This manipulation of concrete enables him to blend architecture harmoniously with its environment, as seen in many of his iconic buildings, including those in Brasília. The versatility of concrete in expressing bold, dynamic shapes aligns with his vision of architecture as an art form, enhancing both the aesthetic and structural characteristics of his works.