The Supreme Court building is currently undergoing some major renovations to repair the crumbling marble on the facade. The front of the building is encased in scaffolding, with a scrim being put up over the scaffolding. Construction is also going on in the grounds on the southern side of the building.
The scrim is still up as of May 2013:
This is how it looked as of October 2012:
This is how it looked as of July 2012: