Stuff, things, clutter. Items stored for years in dark places, items you forget about. Items you buy more of, even if you already have one: it has just disappeared. It's somewhere, but nowhere to be found. One of the things that I've learned in recent years is that stuff will take over the space you have if you don't pay attention to it. And while you may have heard the phrase “you can never have too much storage", when we moved into our new home a couple of years ago, we made some decisions of how much storage we want and how much space we want to have in our house. Space and storage are antagonists in this story. The more you store, the more you keep and the less space you have to move in.
That's a gorgeous green!