What would Catalan independence look like?

People in the Catalonia region of Spain are insisting on going ahead with a referendum for independence on Sunday, despite the government declaring it illegal.
Catalan leaders will not say where the ballot boxes are, but if they manage to pull off the vote - and if Catalans vote yes - they must create a republic from scratch.
Al Jazeera's John Hendren reports from the Catalan town of La Senia.
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