The history of mirrors goes back to the first human gaze in a pond of still water, which in around 6000 BCE evolved to become the ubiquitous object that we call a mirror. To create mirrors, man started with polished stone (or volcanic glass when available), later fabricating them from various metals, finally ending with rough polished man-made glass backed by mercury. This technique was invented in Venice, which during the Renaissance held the monopoly for the production of mirrors.