The amount is simply beyond imagination.

This is my attempt to visualize it:  by creating mega-objects in Minecraft.  Specifically, I intend to render a number of public debt-related items into Minecraft, all made of gold blocks.  The idea is to allow a user to walk up to a gigantic mountain range of gold (or its poly-hedral equivalent).

So far, I'm past the calculations phase and into research.  Specifically, I need to quickly create some rather massive items.  There's no way I can do this by hand.

As you can see from the debt counter, the amount is increasing rapidly.  Hardly surprising, given inflation and the action of compound interest.