Published at Sunday, July 15th 2018, 04:05:41 AM by Sylvia Horton. Bathroom Mirrors. The size of the bathroom is a consideration. You do not want to obtain a bathroom mirror that will make the room seem smaller. And conversely, a small mirror in a large room may get lost. You also need to make sure that there is enough wall space available to hang a mirror. The space may already be determined if there is a pre existing bathroom mirror cabinet or medicine cabinet. The shape will also impact the area. You can choose from square, rectangle, oval or round. Each shape can increase or decrease the perception of the room.