It's built by David Cox, a nanotech expert at the Quantum Detection Group of Britain's National Physical Laboratory. He's accustomed to working with such astonishingly small objects, and used his nano-particle manipulation tools to demonstrate the astonishing accuracy of his work.
He bathed the snowman in blue light to give us this entertaining, snow-blown image. The remarkable flourish of his smiling snowman is its little happy face, carved into the top orb using a focused ion beam. That's no small feat.
Source: dailymail