Paper imitates digital!

The idea is clever and it's a little surprising how no one did this before, especially when considering how much about reading maps consists of folding the damn thing!

I've been cursed at more than once because I didn't fold a map the right way. And like andrewljohnson said in this thread (http://news.ycombinator.com/item?id=1074300), the complication of folding could hardly have been the limiting factor of coming up with this. :)