One way to create a lasting impression with an indoor water feature is with a built-in water wall fountain. The built-in water wall fountain can take on a formal or more casual appearance, depending on the nature of your décor. Have a water wall fountain in an entryway, an atrium or as a centerpiece to your living area. For a formal appearance, the built-in water wall fountain can be part of a masonry wall and take on a nautical theme with a seashell patterned archway. Delicate droplets of water can descend a round pool below. Create a soothing spa in your home with a tiled wall with two offset rows of water spilling out like fine sheets into a square pool below.