The public space is where we, as citizens, come together.
The basic public space is a street, or a square.
But there is much more; metro, parking, field, mountain, bus, football stadium,…
I read above some questions about the public spaces with private owners. I think, if everybody can enter this space without nodiscrimination is a public space. Paradoxly, a public space like a gouvernamental building, would not be (at this time), public space.