Samuel Birch, History of Ancient Pottery: Greek…
“ From the next step in the progress of the manufacture—namely, that of modelling in clay the forms of the physical world—arose the plastic art. Delicate as is the touch of the finger, which the clay seems to obey, almost as if comprehending the intention of the potter’s mind, yet certain forms and ornaments which require a finer point than the nail gave rise to the use of pieces of horn, wood, and metal, and thus contributed to the invention of tools. ”
