To capture the scale of sweeping panoramas ranging from the glacial peaks of Iceland to the vast sea at the center of the Earth, and the intricate detail of petrified mushroom forests and calcified rock formations, Brevig called on the expertise of an array of talented artists, including concept lead artist Erik Tiemens, production designer David Sandefur, director of photography Chuck Schuman and visual effects supervisor Christopher Townsend.

"When creating a fantasy story, you're taking the truth and stretching it," offers Brevig. "We began with the concept art, which was the touchstone for production design, visual effects and cinematography. The final look in the film is the product of tremendous collaboration by nearly 200 artists."

In referencing the concept art, Sandefur remarks that one of the greatest challenges was balancing the real and surreal. "There had to be some level of the fantasy, but at the same time, I wanted to try and maintain a level of realism," he notes. "The texture and color needed to look and feel very real and very rich. And although the audience knows we're in this fictitious world, I'd like them to think that we went to a location and shot underground or in a jungle."

"We approached the look of the film using what we called a 'color script,' which was a plan for the use of color throughout the movie," notes Brevig. "At the beginning of the movie, we start in a muted color range, then we take the audience into a heightened color reality once we get to the center and by the end of the film, they return to a more vivid environment to imply that Trevor's life is brighter and more hopeful."

Production took place in Montreal, which was hardly jungle-like, but surprisingly, the northern city proved invaluable when it came to set designs, particularly its natural surroundings. "One of the things we found helpful was the access just outside of the city to a phenomenal, organic terrain, which we used to come up with the texture and configurations of our sets," explains the production designer. "We took molds off of real surfaces in a lot of different areas and made plaster skins out of those and attached them to the walls."

For the Mushroom House that Trevor, Sean and Hannah find at the center of the Earth, Sandefur remarks, "My team and I spent weeks experimenting with materials to get the surfaces to look just right. After all, what does the inside of a mushroom look like? Can someone get me a few books on interiors of mushroom homes...anyone?"

Sandefur finally decided to use industrial-sized sponges, slicing them into thin slivers and painstakingly lacing them on top of each other to give the surface a porous, organic-looking texture. Once the slivers were bonded together, "we cast surfaces with translucent latex, and then painted and backlit them for a bioluminescent effect," continues Sandefur. "It's like being inside a giant Jack-o-lantern."

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