In the video, a person is seen drawing on a white sheet of paper with a blue marker. The person starts by drawing a red line, then proceeds to draw a blue line that intersects the red line at a right angle. The person continues to draw a blue triangle that is formed by the intersection of the red and blue lines. The person's hand is visible, and they are holding the marker in their right hand. The video is shot from a top-down perspective, and the person's movements are steady and precise. The colors of the marker are vibrant, and the lines are clean and well-defined. The video does not contain any other objects or people, and the background is plain and unobtrusive.