10 Works of Architecture That Reveal the Acrobatic Wonders of Concrete - Photo 4 of 10 - Known for his futuristic concrete designs that seem to outwit gravity throughout Brazil, Brazilian architect Oscar Niemeyer described his Niterói Contemporary Art Museum in Rio de Janeiro as&amp;nbsp;&quot;a flower that rises from the rock.&quot; The organic, saucer-like structure uses concrete to form everything from the main building and its snaking walkway to the benches outside.