This Festschrift has been published in honor of Rinus Plasmeijer to celebrate the combined
occasion of his 61st birthday and the 25th Symposium on Implementation and Application of
Functional Languages IFL 2013 held in Nijmegen The Netherlands in August 2013. Rinus
Plasmeijer was the main designer of the lazy functional programming language Clean and has
always been the leader of the associated research team. He has played a decisive role in making
the Radboud University of Nijmegen an important center of research in functional programming by
organizing and hosting the first few IFL symposia in Nijmegen. This Festschrift contains 19
scientific essays written by former PhD students of Rinus Plasmeijer and researchers in the
field of functional programming who have collaborated with him. The authors write about the
influence the beauty of functional programming has had or still has on their work.
