why can't you just run x11.app and xmonad on mac os? i use spaces on mac os and space 1 is a full-screen (but rootless) x11.app running ratpoison and two giant

why can't you just run x11.app and xmonad on mac os? i use spaces on mac os and space 1 is a full-screen (but rootless) x11.app running ratpoison and two giant xterms. space 2 is a mostly full-screen firefox, space 3 is itunes, etc.