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The top panel allows the windows go to beneath it, emulating the space-saving features of the global menu, without the global menu itself.
The bottom panel also contains a window list and intelligently autohides.
As for the wallpaper, while I am not 'religious', I am deeply interested in theology, and find Jesus' teachings to be as fascinating as any other philosophy of ethics. Religious texts often contain literary value, too. I find the painting deeply moving.