ROTFL... I love Rand, she saved my life. But her characters are as one dimensional as a steam-rolled Bugs Bunny.
Maybe he was being sarcastic. Atlas shrugged is really famous for painfully bad writing when it comes to the characters and dialogue.
Wouldn't a steamrolled Bugs be two-dimensional -- a flat plane, not a line?
On the other hand, an un-steamrolled Bugs Bunny is likewise two-d.
Actually, steam rolling Bugs makes him 2-D. If you wanted to make him 1-D, you'd have to extrude him through a spaghetti machine. (I think there may be a plot line there.)