What is public sphere? Where lies public sphere? Is public sphere presently disappearing, expanding, diminishing or evolving under the influence of technology, globalization, the Internet or any other factor the sociology or cultural analysis might bring in? Does "public sphere" constitute more than a convenient metaphor for specking about the political debate as conveyed by the medias? Can the expression still be considered as an instrumental concept for investigating contemporary social quite literally before elaborating on them from a political philosophy standpoint. The paper is divided into three parts. The first one will summarize and number of assertions and debates around the "public sphere" as they have been taking shape and evolving since Habermas' seminal work of 1962. in a second part, relying on a phenomenological approach, we move from the concept of "public sphere" to the more modest investigation of "public spaces" as we can approach them in everyday realities. In the third and final part, the author attempts at a further mapping of the "political territory" by brining in the work of Eric Weil, a political philosopher who might still have a few things to tell us, even if he published his Philosophie politique almost fifty years ago.