In the video, a person is seen using a glue gun to apply glue to a wooden dowel. The person then places the dowel into a cylindrical object and pushes it down until it is fully inserted. The person then removes the dowel, revealing that the cylindrical object has been hollowed out. The person then places the dowel back into the cylindrical object and pushes it down again. Finally, the person removes the dowel, revealing that the cylindrical object has been hollowed out once again.