The places where the metaphor gets stretched can be frustrating, especially in Windows. You can put Folders on the Desktop, but there's also a "Computer" icon on the desktop which allows you to browse into other folders.. including the desktop?

Then there's your Personal folders.. which are in fact collections of other folders themselves, but appear transparently to be folders- but somewhere on the file system they are actually different folders. But without the benefit of breadcrumbs to help you keep your place in the structure, where did that file actually go?

Don't get me started on shoehorning OneDrive (or was it OneDrive for Business?) into the mix.. where'd I save that file again?

That's why my desktop is so cluttered!