The actual concepts that Dropbox uses are very different (Figure 2.4, right). When an item sits in a folder, the name of that item belongs not to the item itself but rather to the folder containing it. Think of a folder as being a collection of tags, each containing the name of an item (a file or folder) and a link to it. This concept, which I’ll call unix folder, was not invented by Dropbox, but, as its name suggests, was borrowed from Unix.15
I did not know this and it definitely broke my mental model
