In the summer of 2018, the authors of the book stood in the Musée des Arts et Métiers in Paris. They marvelled at the Foucault pendulum, which made its circular movements on a long rope under the dome. Like Casaubon in Umberto Eco's book The Foucault Pendulum, the authors were amazed and wondered what could be at the ideal end of the thread pendulum. The fixed point that could give us support and security in an uncertain world and difficult times? What uncertainties, what times or even what threats are we actually talking about? Where can we find the fixed points, the safe spaces of our lives? This book deals with these and other questions. The authors found inspiration for the book in Umberto Eco. And so it is also a homage to Eco.