could be previewed. Visual effects Visual effects were delivered by London's Moving Picture Company (MPC), and were applied to the 1,000 or so shots in the film, though most of the effects simply painted out puppet supports and similar set equipment. Some visual effects elements—groups of birds and butterflies, were created completely in CG, though others were composited as visual effects from real-life elements. Pete Kozachik explained that the trick for shooting the characters by themselves was obtaining visually interesting shots that would dependably support the director's storytelling, saying: "The challenge is keeping the action clear and simple with lighting and composition. There's a discipline to clear storytelling with these puppets. You want to be abstract, but one can easily go overboard with these critters because they aren't as familiar to the audience as real humans. The characters don't necessarily translate the same as if you're shooting a real person. You have to consciously balance arty atmosphere and graphic clarity so as to not confuse the audience about what it is they're looking at." In a 2005, interview with About.com, Burton spoke about the differences between directing Corpse Bride and The Nightmare Before Christmas, saying: "The difference on that was that one I had designed completely. It was a very completed package in my mind. I felt like it was there. I felt more comfortable with it. With this, it was a bit more organic. It was based on an old folk tale. We kept kind of changing it but, you know, I had a great co-director with Mike Johnson. I feel like we complemented each other quite well. It was just a different movie, a different process." He also spoke about casting Johnny Depp as Victor, saying: "It was weird because we were doing both at the same time. He was Willy Wonka by day and Victor by night so it might have been a little schizophrenic for him. But he’s great. It's the first animated movie he's done and he's always into a challenge. We just treat it like fun and a creative process. Again, that’s the joy of working with him. He's kind of up for anything. He just always adds something to it. The amazing thing is all the actors never worked [together]. They were never in a room together, so they were all doing their voices, except for Albert [Finney] and Joanna [Lumley] did a