Rudolph understood the importance of light, and interlocking space was his specialty. He studied it, utilized it, and savored it throughout many of his works. Since light travels in straight lines, he designed many pieces so that light would reflect directly on individuals, which in turn created welcoming spaces. Paul was a driving force in this new concept of utilizing light. He also designed actual fixtures that still sell today. ”Paul was fascinated with how lighting integral to a space could animate it and transform the whole psychological effect, he thought light was architecture’s fourth dimension,” said Mr. Wagner said, a business partner/friend Rudolph’s.