1. Because it looks good
2. Is a great DIY
3. Is CHEAP!
What a perfect decorating idea! The whole black and white thing looks fab!
Would also work great with a brown timber frame and an old map for an antique feel. You don't even have to frame it!
Or an old-school feel - a bit retro
Or for a purpose... as curtains!!
Or the nifty wall decal!! So much choice!!!!
Or you could take it all the way... and wallpaper the whole room with vintage maps!