The article described an SSD (sensory substitution device) that converts a particular color under a stylus into a sound.

I wonder if you could build an SSD that did a playback of a 2-dimensional scan of an input image in such a way that a blind person could rebuild the 2-dimensional image. Perhaps the brain could pick up something akin to CRT horizontal scan lines. Also, I wonder whether stereophonic output would be advantageous.