This ad was created for a Belgian natural gas company. The purpose was to show the TV audience what "warm looks like", says director Olivier Babinet.

"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."

Here is how they did it, carefully attaching yards of yarn to walls, radiators, and pipes, 40 people working 4 days and nights:

References:

It's December. Brrrr. Is My House Shivering? Krulwich Wonders. NPR http://n.pr/Y97YmJ
A house that knits itself | Colossal http://bit.ly/Y98xNl

Source:
http://feedproxy.google.com/~r/CasesBlog/~3/YlH5PxD-DVs/we-had-very-simple-idea-thats-to-see.html