I can only imagine they’ll probably rely on colonial architecture, seen in cities like Ouro Preto:
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Maybe they’ll even throw in some nods to Oscar Niemeyer’s famous Brasilia buildings (which, funny enough, kinda remind me of EPCOT Center’s old architectural style and its grandeur):
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The thing is, Brazil is such a mashup of different cultures that you could build practically anything (from small villages near rivers and such to European-looking colonial towns to even futuristic buildings full of sweeping curves) and still call it “Brazilian”.