Installing GNOME 3 without uninstalling Unity

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http://askubuntu.com – Is it possible to install GNOME 3 and switch between GNOME and Unity? If I run sudo apt-get install gnome3 will it remove unity, or break it? I wanted to make sure, before I install GNOME. My goal is to try out GNOME, without removing Unity. Or just to be able to switch between them. I've heard some of my friends talk about it should be possible at login screen? (HowTos)