The video shows a person writing on a piece of paper with a blue pen. The person is writing a series of mathematical equations, including addition and subtraction. The person then uses a white pen to write over the blue ink, possibly to correct or emphasize certain parts of the equations. The video is shot from a top-down perspective, focusing on the person's hands and the paper. The person's hands are visible, and they appear to be right-handed. The paper is a standard white sheet of paper, and the blue pen is a standard ballpoint pen. The white pen is also a standard ballpoint pen. The person's writing is neat and legible.