I would like to thank the following individuals for contributing – directly or indirectly – to the realization of this book. In alphabetical order: André Aleman, Ann Avouris, Marten Blom, Jos Brinkmann, Kirstin Daalman, Kelly Diederen, John Enterman, Barbara Fasting, Audrey Fennema, Dominic ffytche, Mark van der Gaag, Rutger Goekoop, Bert van Hemert, Melissa Higgs, Wijbrand Hoek, Ellen van Hummel, René Kahn, King Kho, Jasper Looijestijn, Willemke Marinus, Sankara Narayanan, Bas Neggers, Felix Portnoy, Anne- Marije Rijkaart, Hugo Simons, Karin Slotema, Iris Sommer, Victor Vladár Rivero, Remco de Vries, Renate de Vries, Antoin de Weijer, and an unknown number of anonymous reviewers who helped to move the project forward. Last but not least, I would like to thank the many patients from the Parnassia Bavo Group and elsewhere, who were willing to provide verbal reports of their hallucinations, and to thus share their experiences with me over the years.