Digital BW, The Print

Bruce writes:

> The exception to this is anamorphic lenses used
> for wide screen movies.  They have ovals of confusion
> in the out of focus areas which can look ugly
> on movie stars faces in close-ups.

Would an oval aperture (oriented 90 degrees to the oval of confusion)
correct this?

> So now you will never watch a movie the same way
> again, you'll be looking for the bokeh, as some still
> prefer the old lenses.

I want to know why the entire frame changes shape when focus is pulled from
a distant background to a near foreground.  You can see the whole image
bounce, if you look for it (once you notice it, it's hard to ignore).