Indeed, the 3D cube effect is inspired by Xgl or Looking Glass and the like... But from an abstract point of view it feels like the kind of things Enlightenment

Indeed, the 3D cube effect is inspired by Xgl or Looking Glass and the like... But from an abstract point of view it feels like the kind of things Enlightenment did around the year 2000: You could have windows zooming in and out, swooshing from left to right, accompanied by matching sounds and graphical effects like jelly or bursting in flames. It was totally fun and awesome, especially when compared to Windows 9x at the time, and everyone used it as showcase on how cool a Linux desktop is compared to Windows. But then again, to actually work with the computer, they switched back to FVWM, KDE, or whatever "boring normal" window manager they had. Still, it's a cool showcase for what a compositor with some added shaders can do