ABSTRACT
The easiest way to visualize this is as a top-down view of an open box, inside of which there are several smaller boxes. From your aerial vantage point you can see the large box – the folder, in our analogy – and the contents of all of the smaller boxes – the Projects, Albums and so on. However, if you were to lower yourself so that your face was close to one of the small boxes, you would no longer have an overview of all of the constituent parts, but only those of the smaller box directly in front of you.
