The filmmakers aimed to acquire as much practical imagery as possible, and that resulted in the construction of several gyrosphere rigs, including a motion-controlled version that existed on the back of a truck on a pole arm. "It had three different axes of freedom of movement," explains David Vickery. "We could program these moves so that, if it was being hit by a T. rex tail or a Sinoceratops head, the arm could swing and the gyrosphere could rotate and roll. We'd strap in Bryce and Justice and roll them over and upside down."

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