Made of Japanese paper, aluminum foil, and mineral pigments. This work, which has long been seen in Japanese Zen painting, expresses enlightenment, truth, Buddha nature, the universe as a whole, and peace of mind. This work is backed by silver-colored aluminum foil, which reflects light well. The circular phase is expressed in blue. Nihonga" is based on a style of painting that has existed for more than 1,000 years, and uses traditional materials that have been cultivated throughout history. The technique involves painting on Japanese paper, silk, wood, etc., using natural paints such as sumi ink, iwa-enogu (mineral pigments), gofun (gofun), etc., and glue (nikawawa) as an adhesive. Gold and other metal materials (gold leaf, etc.) are also used. Iwa-enogu, made from ores, is a beautiful, sand-like powder. Mizuhigure, made from clay, is a fine, stretchy paint with fine particles. Artificial versions of iwa-enogu and mizuhoshi-enogu are also made, and are available in a wide variety of colors. Goko, made from shells, is a white pigment with fine particles.