Pareidolia is the phenomenon of perceiving non-existing things in inanimate objects, such as human faces or animal heads in rocks. Pareidolia is a misapprehension of an object by the mind, which alters it according to its own imaginings or completes it to form a familiar image. Over the years, the Swiss painter and writer Jean Willi has photographed rocks that seem to have faces, thereby discovering a realm of stone apparently teeming with petrified “souls.” It is often the sunlight that traces a face in the rock, which then disappears when the light changes. Sometimes it’s only two dark spots like eyes, out of which the viewer fashions a face in the mind’s eye. The question is what do we actually see and what do we consciously or unconsciously turn into something familiar. The dawn of art might even be traced to such subjective sightings. Shamans claim they need to make out faces in plants and stones in order to contact certain spirits. Over the course of his work, the photographer’s gaze has changed to a point where he is convinced that faces are displayed in at least two thirds of rocks and stones. Many of the faces in this book seem so real that it’s hard to believe their features are drawn only by nature and the play of light. It goes without saying that none of the photographed rocks has been rearranged and none of the photos retouched.