Where do unspoken thoughts, unrealized ideas, and suspended reveries go, and can they leave traces in the physical world? In Under Which Tree Did Goethe Sleep?, a mysterious 19th-century manuscript by a pseudo-scientist, Johann Friedrich von W., proposes the existence of the “Mentisphera”: an intermediate reality where the ideas of writers and scientists who shaped Göttingen become tangible. The manuscript also describes a secret optical device (the Mentispeculum) capable of revealing this hidden layer of the world. Guided by this fictional document, the photographer (a former literature student) wanders through Göttingen, photographing places, fragments and encounters with local figures who seem to guard clues to the Mentisphera. Set in a historic “city of knowledge”, the project treats the urban fabric, its eccentric inhabitants and its institutions as a single anthropological territory where knowledge and imagination sediment in space. Blending contemporary photographs with archival traces and documents, the work unfolds as a hybrid photo-literary narrative, part investigation, part reverie. It currently exists as a first dummy book prototype, accompanied by a booklet reproducing the manuscript and its “theory”.