阴阳 “yin and yang“ created by soft-ground etching technique (Vernice molle) 9921x7015 600 dpi “Etching” is an intaglio printmaking process in which lines or areas are incised using acid into a metal plate in order to hold the ink. In etching, the plate can be made of iron, copper, or zinc. “Fish” is a symbol of luck, a symbol of happiness, well-being and abundance.