Knitting is so cool, and so hot. The YouTube description says: “The idea of the film is simple. How to visualize the warmth of natural gas? By the use of the stop motion technic, we see how warmth spreads through the house as knitted wool. A film of TBWA Brussels, directed by Olivier Babinet produced by Lovo Films.” The advertisement is for Belgian Natural Gas. HERE‘s the “how they did it” video.