"Well, I’ve seen CG fire before and yes, I thought that it would be easier. We all did which is why we come out February 16, but we were supposed to come out in August. Literally, there will be FX delivered up until the end of January 30 because we had to write new programs. Fire is fucking tricky, man. Look at that fire which looks cool and then you move it and you put it on film at twenty four frames per second it changes everything. It all of a sudden looks really flickery and light and not strong, and so you add liquid to it to make it feel stronger and smoother and whatnot, but then it’s like Ghost Rider goes that way and the fire stays here which it really would as a sort of ghost image. We didn’t want that because it looked weird. Fire has to be a Ghost Rider. He commands the fire. The fire doesn’t command him. All of these little things become like your life, and so it’s really about – like I’ve always said – looking at the greatest CG creations which is Gollum, I think. It’s probably like Gollum or the last ‘Pirates’ Davy Jones was genius. It’s amazing, right? Those things are great because you have expression. You have eyes. Gollum’s eyes are huge and you’ve got lines in the eyes and the lips and the teeth are like this. We didn’t have any of that. We had no expression. So you’ve got a skull that’s got no eyes, no lips, no tongue, it’s got no wrinkles. All you’ve got is this fucking skull. So you have to deal with that, and then my idea was to use the fire to give it expression. Once you do that that’s a whole new thing now and the fire has to change colors. It’s got to get smaller when he’s sad and go blue. Then angry goes white hot and it gets super high and that became a whole other thing."
January 1, 1970
https://en.wikiquote.org/wiki/Ghost_Rider_(2007_film)