Marshall Field’s new manufacturing process was so advanced the press called the first Karastan rugs “Mystery Rugs".
To share this mystery with the public Karastan did the unthinkable. They created a large version of it's Kirman pattern to put on display at the 1933-34 Chicago World's Fair
But instead of hanging it up for people to view, they put it on the ground and let 5 million people walk all over it.
Afterwards they cleaned only half of the rug to see how well it stood. The unwashed half was almost unrecgnizable but the other half returned to it's original beauty and looked as if nothing ever happened to it.