Raymond Roussel approached the commercial lillustrator Henri Zo to produce a set of fifty nine illustrations to his written piece, New Impressions of Africa. The contact was made through a detective agency to conceal the author's identity and intent. The images were printed so as to be visible only when the pages were cut, and bore little relevance to the text itself.

This is a selection only, and gives you the general idea. One of the illustrations shows a man trying to look at illustrations in an uncut book.