Eben was considered a master at improvisation on the organ and piano, but composition remained his main area of interest. However, many of his organ compositions in particular were based on his public improvisations. These improvisations were the origin for the Two Choral Fantasies, Landscapes of Patmos, and Job. Eben improvised and developed a cycle of organ movements in the years from 1991 to 2003 based on excerpts from John Comenius' famous book, "Labyrinth of the World and the Paradise of the Heart" that became a published work in response to positive reception.