Bathtubs have shifted from public bathrooms to commonly used built-in bathrooms. The demand for freestanding bathtubs is growing. The available designs, materials, colors, sizes and features have grown significantly. A variety of options are available, such as headrests and backrests, lighting, multiple colors and finishes (matte or glossy), recirculating water, and more. Deeper models are available to prevent overflow and completely submerge the body. Bathtubs are freestanding, adjacent to the wall, and can be used in more compact spaces. At one time, only cast iron bathtubs were available. Later, lighter acrylics became popular. Today, there are newer, more efficient materials such as composite materials, as well as wood, enamel, fiberglass, natural stone and copper. Homeowners and designers are trying to eliminate large built-in tubs that take up too much space. Modern freestanding tubs are becoming more popular because they are seen as the centerpiece of modern bathroom design