The simplicity of his architecture emphasizes the concept of sensation and physical experiences, mainly influenced by Japanese culture. The religious term Zen, focuses on the concept of simplicity and concentrates on inner feeling rather than outward appearance. Zen influences vividly show in Ando's work and became its distinguishing mark. In order to practice the idea of simplicity, Ando's architecture is mostly constructed with concrete, providing a sense of cleanliness and weightlessness (even though concrete is a heavy material) at the same time. Due to the simplicity of the exterior, construction, and organization of the space are relatively potential in order to represent the aesthetic of sensation.