Minecraft wiki entry for Furniture, associated text: You can make an acceptable looking sink and mirror combination by making a section at least 3 blocks wide of your floor material. In the middle "2nd" block place your chosen sink. Surround the left and right sides of the sink with your wall material as well as the back at least 2 blocks high. Replace the block that is behind and above the sink with your "mirror". If you have it, you can use ice, otherwise use a glass pane and completely surround it with wall blocks to make it a full pane. You might put a water block behind the glass, just for "atmosphere".