Work environment

Sometimes the lack of interaction with my fellow co-workers bothers me. Especially on weekends. Is it because my back is to them (since whoever designed the webcenter was obviously into some bad feng shui)? It it that I'm new and they need to get used to me?
Honestly, I don't usually need to actually interact with them, but that doesn't mean that I don't want to. I'm not sure how to remedy this. I try to be friendly but don;t want to come across as rude and butting into their conversations.