"The magnificent Beaux Arts building that houses the Brooklyn Museum was designed by McKim, Mead and White in 1893." It originally had a huge staircase leading up to the columns. But that staircase was difficult to climb and "by the mid-thirties" it was regarded as an obstacle, so it was removed. The glass entrance pavilion and lobby were installed in 2004. It echoes the old staircase while providing a light and airy introduction to the museum.|
(Info in quotes from _Brooklyn Museum: Building for the Future_, a booklet I got as a souvenir which shows all the stages of the museum building's evolution.
Also, you can see part of one of the Murakami sculptures through the glass window. The rest of his fun and fanciful exhibit could not be photographed.