The wall behind which you occupy your computer and never look at. Where you can hang things that you don't wont to look at but ethically you should hang like your picture of your wife. This wall is what people who video chat with you see, so things like posters of iron maiden, energizer bunnies and playmobile men can occupy the space you prefer to encapsulate yourself in.

When you eat dirt for the first time and leave your family to build a shack in the woods