Explanation : The lectures link the emergence of a “public sphere” in Europe and the Middle East to new practices and spaces of sociability—especially coffee and tobacco consumption in coffeehouses—which enabled regular gathering, conversation, and the circulation of opinions. The wider imperial and trade networks explain how these commodities and habits spread, but the direct “public sphere” mechanism is mainly coffeehouse sociability. (Lecture/Reading: Grehan, “Smoking and sociability in the Ottoman Empire”; broader global-context framing: Breen, The Age of Intoxication.)