This is art of street tactile pavers for the blind. They come in all colors. Yellow is the most used for it is a color those with poor vision can see. The tactile bumps can be felt with a cane or by the feet. Circular bumps mean stop, while straight lines mean go. Tactile paving is a Japanese invention, and was originally designed in 1965 by Seiichi Miyake, who had the desire to help visually impaired people to safely move around outside, and its use was popularised by the Japan Railway due to its widespread installation on train platforms in the 1970s.