I'm wondering if anyone knows how they lit a lot of the exteriors from the movie Pan's Labyrinth. There is a lot of beautiful halo light and I am wondering whether they used fixtures to mimic sunlight or they just used the sun as the actual source. There seems to be lots of 'hot spots' in the background.
Also, was the weird stuff in the air created on set or in post? It looks like it was done in post.