The Group of 5 evokes the five-branch star symbolizing the perfect man drawn by Leonardo da Vinci and represents the therapists who helped write this book. These therapists include Kristiane Roy, Lisa C. Bergeron, Klaire D. Roy, Richard Frappier, Andre Lavoie, Gisele Lavoie, Johanne Marier, Fran ois Nicol, Sylvain Plante, Jacqueline Sylvain, and Marcel Tardif. Their areas of expertise range from Western medicine to psychology to massage therapy, but the one field they all have in common is lithotherapy, the application of stones to healing (from the Greek root words lithos, meaning stone, and therapeia, meaning healing).