The video shows a person's hand holding a marker and writing on a piece of paper. The person is using a ruler to draw straight lines on the paper. The background is a rocky surface, and the lighting is dim. The person's hand is steady, and the marker moves smoothly across the paper. The ruler is used to ensure that the lines are even and precise. The person appears to be focused on their task, and the video captures the process of drawing straight lines with a marker and ruler.