In the video, a young girl is seen sitting at a table with a homemade marble run made out of cardboard. She is holding a marble and places it at the top of the run. The marble then rolls down the run, and the girl watches it with excitement. She then gives a thumbs up, indicating her satisfaction with the marble run. The marble run has several twists and turns, and the girl seems to have put a lot of effort into creating it. The video captures the joy and creativity of the girl as she plays with her homemade toy.