Cyberchase: Intersecting Lines
Inez and Digit are trying to determine the location of the Transformatron so that they can remove the Network Interface Card (NIC) from it and save Motherboard. Both Matt and Jackie can see the Transformatron, and their line of vision is depicted as parallel lines. Digit realizes he made a mistake in the diagram, so he moves the rock and redraws the line using the string. They find that the lines intersect and determine that the Transformatron is at the point of intersection.