Blue Solar Road Markers Pedestrian Cat Eyes Cat's eyes were the earliest form of reflective pavement markers, and are in use in the United Kingdom and other parts of the world. They were invented in the United Kingdom in 1933 by Percy Shaw and patented in 1934 (UK patents 436,290 and 457,536 ), and the United States in 1939 (U.S. patent 2,146,359 ).