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In addition to auditory clue, blind people always refer to airflow around to understand the environment. This concept is to use shaped airflow for blind people to detect the position of oncoming public device (such as lift and its control panel) or obstacles (such as wall) in the open space. The air clue also reduces the stress level when blind people are exposed in the public. Even better, the slow moving air clue doesn’t interfere with any person around but just feel a cool breeze. The breeze shape varies from lines, points and curve shapes to provide the road information. We believe that the blind can feel more freely and confidently to mo