Codex Seraphinianus - Wikipedia
Frederic Brodbeck

Codex Seraphinianus , originally published in 1981, is an illustrated encyclopedia of an imaginary world, created by the Italian artist, architect, and industrial designer Luigi Serafini during thirty months, from 1976 to 1978. The book is approximately 360 pages long (depending on edition), and written in a cipher alphabet in a constructed language.