Annemor Sundbø’s Invisible Threads in Knitting (translated into English by Carol Huebscher Rhoades) is a charming history of Norwegian knitting and cultural traditions. Sundbø owned a wool recycling factory in Norway, and saved countless mittens, socks and sweaters from the shredding machine. She ponders the lives of each piece of knitting from its origin (knit lovingly by hand), through the first phase of home recycling (re-fashioning as needed into new garments). She follows socks and sweaters as they begin to unravel and imagines them re-made into mittens, slippers, even underwear. But it was only when they finally reached the end of their useful lives that she got ahold of them---when these enduring pieces were consigned to the wool stripper to become shoddy, and made into batting for comforters.
See also: Sundbø, Annemor. Everyday Knitting: Treasures from a Rag Pile (Kristiansand : Torridal Tweed, 2000).