“Using a tiny heated probe, a team of scientists have ‘painted’ a grayscale replica of the Mona Lisa that is more than 25,000 times smaller than the original. The ‘Mini Lisa,’ as it is known, is just 30 millionths of a meter wide. That’s roughly 0.001 inches, or one third of the width of a human hair. The team created it using a powerful microscope and a process known as ThermoChemical NanoLithography, or TCNL. Each ‘pixel’ was 125 billionths of a meter wide – smaller than the smallest known bacteria – and Carroll and the rest of the research team went pixel-by-pixel to create the reproduction.”

http://www.csmonitor.com/Science/2013/0807/Mini-Lisa-Georgia-Tech-researchers-create-world-s-tiniest-da-Vinci-reproduction

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