Saw this interesting concept from my colleague's desk, she said it's to indicate where the vendors (those she is expediting) are.
Hmmm, I like it and I wish I could do so. Not for work but for my travel dreams. When I have my own living space in future, I will buy a big map of the world and paste on the wall, indicating where I had been and where I wish to travel. Good idea, right? At least I will love this deco at my own room.