From the website:
The Knitting Machine is just one of artist Dave Cole's large scale projects that consist of ambitiously knitting unconventional materials. In this particular piece Cole uses two excavation tractors equipped with 20' knitting needles to assemble a giant American flag in time for the 4th of July (2005).
Link - via Unique Daily
you are doing a great job
-check it out it has many more artist like this!