Over the years, like everything else in the world, cartography has changed. Previously, all the maps were made by hand and cartographers had to travel to get the maps right. Nowadays almost everything happens with the computer and satellites. You can imagine that when you put all the traveling and sketching into your maps, and a (lazy) competitor would just buy your map and copy it, you would be pretty pissed. To prevent this, cartographers came up with a plan. They added so called Paper Towns.