I like the reverse video mode of Emacs sometimes, but not always. I would like to have a way of toggling this property without having to restart Emacs (right now the only way of setting this property is to start Emacs with or without the -rv command line argument). I have tried M-: (set-frame-parameter (selected-frame) 'reverse t) to turn it on and (set-frame-parameter (selected-frame) 'reverse nil) and M-: (set-frame-parameter (selected-frame) 'reverse nil) to turn it off, but this does not work.
Does anyone have any suggestions or is the reverse video effect something that can only be specified at start up?