“The camera feed is reduced in resolution to a grid of four hundred gray-scale pixels, transmitted to his tongue via a corresponding grid of four hundred tiny electrodes on the lollipop. Dark pixels provide a strong shock; lighter pixels merely tingle. The resulting vision is a sensation that Weihenmayer describes as ‘pictures being painted with tiny bubbles.'” The New Yorker’s Nicola Twilley describes how some blind people (including a mountain climber) are learning to see with their tongue.