The image is a display case in a museum. The display case is made of glass and has a black and white photograph of a large cannon on the left side. The cannon is green in color and appears to be old and weathered. On the right side of the display case, there is a small plaque with information about the cannon and its history. The background of the image shows a view of a city skyline with buildings and trees. The text on the display is written in black and is likely a description of the cannon's history.