Let's say you get your hands on a fascinating 100+ year-old Caucasian rug (like the 3x5 Kuba/Shirvan in the photo), and do not want to destroy it and its history by having it walked on, cat-scratched or dog-chewed or dog-peed. (They were made for bare feet, and all Caucasian rugs were rather small.)
Well, you can hang it like a tapestry - like the work of art which it is, and focus on the details and patterns that you would cease to notice if you put it on the floor.
Rug Rat likes these wall hangers.