(AFP) -

Carl Jung's Red Book, regarded as one of the most important unpublished works in the history of psychology, was put on display Wednesday for the first time.

The book, which actually is entitled Liber Novus, is 205 pages of handwritten text and several illustrations that recall medieval works, all bound in red leather.

It is on display here at the Rubin Museum through January 25.

Written between 1914 and 1930, the "Red Book" as Jung himself nicknamed it, is considered the leading source of the thinking of the Swiss social scientist, and an exploration of his unconscious.

The exhibit coincides with its publication, including translation to English, by W.W. Norton.