Architecture Puzzler #93

Over time some woods will darken or become "richer" looking, developing a "patina." Others will fade and lose their brilliance. Which of the following woods grow richer and which fade? Walnut, padauk, cherry, poplar, maple, mahogany, purple heart.

This Brazilian architect gave a face to the capitol city of Brasilia with the design for its cathedral, housing, and congress building. Of his work he said: "I seek beauty, I want to raise the spiritual level of architecture." Whom do I refer to?