The brainchild of product designers Merel Karhof and Emiel Steenhuizen, the Wind Knitting Factory is an ingenious contraption that attaches to the outside of a building. Just feed it yarn and it creates an endless skein of scarf, which can be cut from time to time and sewn off into individual scarves. Each scarf comes with its own label telling you exactly how long your scarf took to be knitted and on what date.