The only feature that doesn't work from the demo video is the slide-presentation on the top of the cube. Currently, unless I do a CVS compile, I can't get any SVG image on top of the cube. But, honestly, the feature itself appears to be just a hack to be only used in the demonstration. As it is now, it simple allows you to add SVG images to a list and then using two keyboard keys to go back and forth through them. Perhaps someday they can modify the top and bottom to become "super-desktops" that are directly accessible from any of the other virtual desktops. (The system I'm thinking about would be setup as now, where the 4 desktops are arranged to be viewable from one plane. Then, hitting up would spin the cube up, reorienting the face so it's correctly viewable (up is up, otherwise from some virtual desktops it could be up is left, etc.). Hitting down then would spin the cube back down and put you on your last virtual desktop. How these two super-desktops could be used is up to discussion.)
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