Pneumatic actuators are powerful enough to move heavier objects like simulated limbs, while hydraulics are used more for large figures. On/off type movement would cause an arm to be lifted (for example) either up over an animatron's head or down next to its body, but with no halting or change of speed in between. To create more realistic movement in large figures, an analog system was used. This gave the figures' body parts a full range of fluid motion, rather than only two positions.