a considerate neighbor wraps a thick towel around a loud vacuum cleaner while cleaning their doorway. The towel completely covers the motor section where most noise comes from. Before wrapping, sound waves visibly radiated outward in all directions from the machine. After wrapping with the towel, the sound waves become much smaller and weaker. Other residents in nearby doorways look relieved as the harsh noise becomes gentler. A elderly person down the hall smiles and gives a thumbs up of appreciation. sound being made quieter and less clear by covering and wrapping