We have a revolving panel that can be rotated out of the way. In previous versions if you set the view to realistic you wouldn't be able to see what the space would look like closed unless you move the panels out of the way. But now with 2012 you can.
So you just simply right click on an object & go to Override graphics in view by element:
Then Click on Ghost Surfaces:
And Voila! Ghosted panels that give you and your client an idea of what the space will look like with the panels both open & closed.