Nadin researched aspects of intelligent interfaces in collaboration with Brown University (Andries van Dam, Steve Feiner). The main goal was to determine the extent to which data could be compressed for the elaboration of a digital book. Design for interaction between user and "book" was implemented.
In 1989-1990, Nadin worked with David Hodge and others in the elaboration of the "Crystal Book" as a portable device, but it was never built.
The goal of many computer researchers, the portable digital book became a reality in 1998.