Inspiried by the way bats use sonar to echolocate, a team added a sonar device to walking canes that emits high pitched sounds that are too high for the human ear, and detects the waves that bounce off of objects up to 3 meters away. If an object is detected, the device sends signals to 1 or 4 pulsating pads (depending on the location in 3D space) that pulse at a different frequency depending on the proximity of the object.

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