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What item do you need to enjoy the new White House augmented reality app?

Answer: a dollar bill

If you already have a smartphone capable of downloading apps, the only other thing you need in order to use the new 1600 app is a dollar bill.

The way it works is simple. After downloading the app, point your smartphone camera at a plain ol' dollar bill — and an interactive, 3-D video of the White House will pop up. As DCInno points out, you can't tour the building's interior, but you do get to see a helicopter landing on the South Lawn and, perhaps best of all, Obama casually building a snowman.