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Here, we see Mint "MGSE" (Mint GNOME Shell Extensions) a desktop layer that sits on top of Gnome 3 that makes it possible for you to use GNOME 3 pretty much as if it were using Mint 11'sGNOME 2.32 interface.
And, why would you want to do that? Well, as you can see, GNOME 3.2's interface looks quite different. Many users really dislike this interface.