In a factory, the metal end of a robotic arm reaches through an opening under metal fencing and lays onto a white rectangle on a pedestal.
The arm retracts back through the opening and turns left. It extends upward in a repetitive pumping motion, moving up, then slightly right.
The white arm as three joints, or points of articulation. A caution sign hangs from the fencing above the opening.
The arm turns the other way, then slides backward.
The arm tilts down and it moves under the fencing above the opening once more. The end lowers onto the white rectangle.