Cabrera published a book, "The Message of the Engraved Stones of Ica" on the subject, discussing his theories of the origins and meaning of the stones. In this he argued that the stones were evidence "that man is at least 405 million years old" and for what he calls "gliptolithic" man, humans from another planet. He said that "Through the transplantation of cognitive codes to highly intelligent primates, the men from outer space created new men on earth." The Ica stones achieved greater popular interest when Cabrera abandoned his medical career and opened a museum to feature several thousand of the stones in 1996.