Colours

Once upon a time, Barcelona Council advertised its presence thus:

That is, white lettering on turquoise stood for the municipal corportation. By 2006, at least one campaign had abandoned turquoise for red:

Since late 2010, many public building administered by Barcelona council have be rebranded to make the link more conspicuous:

One notices that white lettering on a red background carries the most important message content, and that every plaque carries with it an implicit good vibe (the letter 'B' and the Catalan for 'well' or 'good' are homophones). To what might we owe this new colour scheme? Just a suggestion: