Republicanism is the political science expression of liberalism. As with democracy, they require the osmosis of interaction, deliberation, competition, discourse and openness for them to have any public legitimacy. When the polis is fenced and the arms of the state oversee - it ceases to be the political republic and instead becomes the state's exclusive executive garden. The polis is temporarily drained until the state leaves and the urbanites come back.

Photo from Sydney Daily Photo: Wrapping democracy in a 3m high fence (more)
Gary Sauer-Thompson has an interesting comment that deserves to stand on its own; "Urban space and urbanity are important concepts and any republicanism that is worth its salt needs this built into its conception of freedom." (more)
Cam Riley: South Sea Republic. Freedom, liberty, equity and an Australian Republic.