Bound for Glory - ominous cloud - how did they do that?

it was a combination by Albert Whitlock of a matte painting and muslin...put on a roller and slowly rotated...adding dust and the matte elements. Its a great effect...look at the book INVISIBLE ART for some extraordinary insight of FX from before the mixed blessing that is C.G

thanks INVISIBLE ART certainly seems a good recommendation.

Don: No, you are going to have to turn this opportunity yes!