Then by your thoughts, Windows is a copy of OS X? I have seen UK versions of Windows where the taskbar/superbar is on top. Add in a dock and you have OS X.
No, that's the exact opposite of my point. My point is that there are only a couple of different configurations I'd even want my desktop to look like. They all look similar to an extent, but so what? We've seen what trying to be different did for Windows 8. I'm not arguing against anyone or picking sides, I think it just shows refinement to a point where we've figured out what works in a desktop UI, and everyone has their little spin on it, but you can point out similarities in any of them. I even think it's a good example of where technology patents haven't destroyed the ability for healthy competition and improvement all around for all parties.