Green Book

Severian describes two of the books he collects at the Library. One is a huge book, 40" x 15" in size, that is a genealogy of Thecla's family. The other is a small green book, the size of one's palm, that consists of prayers and ikons. Two families. Two groups of "exalted, exultant" people. One inflating itself with a huge book, but representing the old world; the other humbly satisfied with a tiny book, but representing the world to come. Green book. Green man. The world to come. Nutria