The Public sphere (n.) is a common space of disclosure for everyone who acts in it and perceives it. It is grounded in trust in action and speech as a mode of being together, neither the reality of one's self, of one's own identity, nor the reality of the surrounding world can be established beyond doubt.
The Public sphere (n.) is a common space that comes into being when citizens act in concert to manifest political freedom and equality.
The Public sphere (n.) is a common world and stable background of artifacts, institutions, and settings that serve as the context for our activities.
The Public sphere (n.) is a space which, in contrast to the public sphere where beings come together to discuss, dissent and decide, is unable to give form to human uniqueness.
The Public sphere (n.) is common sense, 'the sixth and highest sense' which relates the 'five strictly individual senses' and their data into the common world.
The Public sphere (n.) is the 'reality' of the world, the principle of 'being common' its being between, literally its interest (inter esse) for all those who, through their common sense, hold it in common.
The Public sphere (n.) is the common world that gathers us together and yet prevents our falling over each other.