朱 means 'scarlet'

Nature abounds in these essays, including blood-red sunsets, brightly colored birds, and fall foliage. Logically, art forms such as painting, calligraphy, and lacquering also emerge as central themes. But who would have guessed that color ties in with many body parts: blood, the eye, lips, skin, cells, and even a point where energy is concentrated. Mental states also matter here with faces flushed with rage, diligence in work, depression and lifelessness, and vitality. Moreover, multiple essays touch on religion, minerals (including one ingested for longevity), and old forms of currency (one of which was chocolate!).