Meanwhile, a Swedish sound design company has come up with an inventive way to assist sight-impaired runners: Sound, or rather, "hyper directional sound.". The company, Lexter, spent two years creating what is essentially an auditory flashlight which projects a narrow-band beam of sound to guide runners along a path. Should runners stray from their lane, the tones can guide them back into place. The system uses a pair of speakers to emit the tones, and given that some special olympic athletes have expressed interest, might be available on indoor tracks sooner rather than later.

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