a pulsating light in their chest which would fluctuate even when the character was stationary in-shot. They also adjusted the eyes, making the sockets shallower than on the sets and giving them a pupil-like glow. While redesigning the Toa, the team consulted with the original Lego staff to determine what materials the characters were made of: the muscles were compared to rubber, the bones described as a mesh of titanium alloy and carbon fibre, while the armour was made of Kevlar. In general, the outer shells remained mostly unchanged from the sets, although the visible gears were removed and armour was fitted to their backs. The Toa were also bulked up a little when compared to their sets so their feats would be believable for viewers. Several external features were redesigned for the movie, including the introduction of a movable mouth to allow for a more human character, and a four-pronged mechanical tongue to make them look less like dolls. Other characters used lights behind their masks to form mouth movement. Particular emphasis was placed on the eyebrows and lips of characters. The main change from the original models was the inclusion of hands, which was a necessity if the character performances were to be made realistic. Custom texture maps were created for each character so they would appear unique. In addition to reinventing old characters, the team created original character designs with Lego staff. Makuta, who had only been briefly glimpsed in the comics and web animations, was created through a "Frankenstein principle", taking parts and pieces from multiple Bionicle sets to create the ultimate Bionicle villain. Other original creations included Takua's pet crab Pewku, and a Gukko Bird designed to transport two Matoran. The Rahkshi are described by Bob Thompson as "like hounds hunting down the [Mask of Light]". They were created by Swinnerton, and comic writer Alan Grant helped develop their characters. They were designed to appear more machine-like than the rest of the cast, and their design were strongly inspired by the bio-mechanical artworks of H. R. Giger. Audio Voice casting was managed by Kris Zimmerman, who chose voice actors that seemed to suit certain roles: the Matoran were voiced by young adults, while the Turaga were voiced by older actors. The voice actors and their performances were chosen so they would not sound like they came from a specific area of the world, instead sound