With posts on giant sculptures of moose, horses, hands etc you have come to think of OTN as the place where big is always better. Here to fly in the face of all that sculptural showing off is the smallest reproduction of the Mona Lisa ever. The tree-trunk-kind-of-thing you can see is a human hair the painting 25,000 times smaller than the one in the Louvre. The method? Heating a needle on an atomic-force microscope. But you knew that.