Is this level of detail in a hand made object really surprising? The Avogadro Project involved making silicon balls with a mass of 1kg and surface irregulariti

Is this level of detail in a hand made object really surprising? The Avogadro Project involved making silicon balls with a mass of 1kg and surface irregularities of the order of a few nanometres. Achim Leistner, a master lens maker, finished the spheres by hand as he was able to feel surface imperfections of the order of a few nanometres. A similarly skilled person could have lived in 1500 BC. [1] https://www.abc.net.au/catalyst/making-the-worlds-perfect-kilo/11009934 https://www.abc.net.au/catalyst/making-the-worlds-perfect-ki...