Recreational mathematics is thriving at the University of Calgar. Some would say that it is a hotbed for recreational mathematics, for it is the home of the Strens Collection of recreational mathematics materials. The Strens Collection is the most complete library of recreational mathematics in the world. In August of 1986, a special conference on recreational mathematics was held at the University of Calgary to celebrate the founding of the Strens Collection. Leading practitioners of recreational mathematics from around the world gathered in Calgary to share with each other the joy and spirit of play that is to be found in recreational mathematics. the papers in this volume, the proceedings of that conference, represent a veritable treasure trove of recreational mathematics by a star-studded cast: Leon Bankoff, Elwyn Berlekamp, H.S.M Coxeter, Ken Falconer, Branko Grunbaum, Richard Guy, Doris Schattssschneider, David Singmaster, Athelstan Spilhaus, Stan Wagon and many others. You will not soon find another collection of wonderful articles on recreational mathematics by a more distinguished group of authors. If you are interested in tessellations, Escher, tiling, Rubik's cube, pentominoes, games, puzzles, the arbelos, Henry Dudeney, or change ringing, then this book is a must for you. If you believe that recreational mathematics must be mathematics that is fun, then look no further, for The Lighter Side of Mathematics is full of fun.