"When we first proposed it, we knew that it was going to be really, really challenging. I mean, for a lot of reasons. But one of the big reasons is two-thirds of the movie takes place underwater. All that requires a lot of animation in this animated films. We have character animation. The artist who animate the characters. They’re kind of like actors. We always felt they are actors with a pencil. Glen Keane and Mark Henn who did Ariel. That’s what they do. Then, we have effects animators. Effects animators do the non-character stuff that moves which is like water waves or bubbles. Or fire or smoke or light effects, if there’s anything that moves that isn’t the character. This probably had more character animation than any Disney movie project since “Fantasia.” This really had a lot of effects, even with the character stuff — like whenever Ariel is underwater, her hair has to move all the time. Hair moving underwater is tricky. We had a lot of meetings about hair. One of the extras in the video is some of the live action footage that we shot for reference to see the hair floating."