In the video, a person is seen using a ruler and a black marker to draw lines on a piece of cardboard. The person is using the ruler to ensure that the lines are straight and even. The cardboard is placed on a flat surface, and the person's hands are visible as they draw the lines. The marker is held firmly in one hand while the other hand holds the ruler in place. The person's movements are steady and precise, indicating that they are experienced in this task. The video does not show the final result of the drawing, but it is clear that the person is creating a pattern or design on the cardboard.