We know the specific strengths of various cities, are aware of their ranking, are able to discuss their density and growth. But what do all cities have in common, what do we know about the “lowest common denominator”? The “city as a species”, the “primal genetic material of the city”: this is the subject of A Quantum City. This colossal work is a love letter to the city and intellectual culture. We follow the fictional narrative figure, Orlando, beginning in 320 BC, on his odyssey through the Western world up to the present time. The book is divided into four interrelated chapters and can be read page by page in a discursive manner, however randomly browsing through the book also offers new and multi-faceted interpretations. Great intellectual achievements are compared with obscure and mundane events. A Quantum City offers an inspiring view of the city that is in us and around us.