Letterbox, Winamp, Geiss

Now that I am running W2K with DirectX, I downloaded the Geiss visualization plug-in and have not stopped playing with this thing since. One interesting note is the effect of letterboxing the
display. The black border really helps focus the display itself. I am not sure if this is because
I watched and like so many letterboxed movies, or if this is a real way to aid visual focus.