Patrick Gill is excited to show me a small, fuzzy-looking picture of the Mona Lisa, printed in black and white on a piece of paper. It’s not much to look at, literally, but it’s unmistakably her, with long dark hair and that mysterious smile.
More intriguing than the low-resolution image of da Vinci’s masterpiece, though, is how the picture was created: with a lens-free camera that, at 200 micrometers across, is smaller than a pencil point.
