Thread:VisualEditor/Feedback/differentiation between editing screen / page viewing

I find it very difficult to tell at-a-glance when I'm editing with the visualeditor (using alpha on En:wp). With 'normal' editing it's obvious, because the source looks different from the text. In the visual editor, seems like we should change the background color of the edit window -- or a big red banner at the top, or something -- to let you know when you're editing. Otherwise in vector it basically all looks the same, which is confusing.