In a special essay, Adrian Frutiger investigates the relationship between geometric signs and the human world of feelings. An inborn geometry of feelings lies deep within human beings. Frutiger attempts to employ elementary signs and fundamental patterns such as the cross, square and other signs in order to arrive at and bring to light analytical deliberations about the behavior of the viewer. Astounding results come to light therein. Frutiger arrives at a duality of forms through the presentation and description of basic symbols such as the square, the circle, the triangle and the line. Throughout all of the human undertakings to comprehend oneself and the environment, the explorations of duality appear over and over again: life and death, the here and the hereafter, and good and evil, which have led to many dogmas and types of weltanschauung. The mere contrast between conscious activity during the day and unconscious absence during the night presents the most important duality. Duality has been expressed in series of signs since time immemorial.At the end, a selection of more complex sign systems, the complete signs, as Frutiger calls them, is selected from numerous possible systems. Perhaps the desire might arise in the reader to search for further figures while contemplating the work at hand.