Ultrasonic speakers let people who are blind read Braille in mid-air

People who are blind can read using a device that uses ultrasonic speakers to create points in mid-air similar to the dots that form Braille characters

Source:
https://www.newscientist.com/article/2244446-ultrasonic-speakers-let-people-who-are-blind-read-braille-in-mid-air/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home