A rigid frame is fitted into a suitably-sized and positioned aperture in an external door.

Attached to the frame, in place of the more usual plastic or metal shutter, is a classic Northern English "Flat cap" as seen in many movies from the early 20th Century.

The cap is sprayed with waterproofing to prevent deterioration.

Magnets sewn into the brim of the cap stop it swinging open in the wind, but do not hold it so firmly that animals cannot push it aside to pass in and out.
-- 8th of 7, Nov 11 2008

are we being kind to cats here? <worried>
-- po, Nov 11 2008


Is this so that a few times a day, just for an instant, your cat will look very jaunty?
-- nomocrow, Nov 11 2008


I'm worried about the animals that pass out.
-- hattiel, Nov 12 2008


// squeezing through small apertures //

It's a fashion thing. Apparently, turret hatches are being worn lower this year.
-- 8th of 7, Nov 12 2008



random, halfbakery