low-resolution grayscale image of what's in front of you run a wire to a rectangular array of electrodes that you place on top of the tongue so the each pixel maps to a point on your tongue and maybe a high voltage is a bright pixel and a low voltage is a dark pixel and even as adults you and I today would be able to learn to see you about tongues in like tens they only ten-thirty 10 20 minutes human echolocation well you need a you know snap your fingers right I'll click your tongue and there are there actually schools today training blind