Items that are often present inside a billionaire's home include fine home furnishings, rare art pieces, an indoor swimming pool, an exercise facility, and a large number of vehicles. However, every billionaire's collection of household goods reflects the tastes and preferences of that individual. Furthermore, many billionaires have multiple homes, each of which features a distinctive character, theme or aesthetic.
Located in Medina, Washington, the mansion of Microsoft founder Bill Gates spans 66,000 square feet and contains half a million board feet of lumber, according to a 2014 report by Business Insider. The home boasts high-tech sensors to help guests monitor their rooms' lighting and climate, a pool with an underwater music system, and a trampoline room with a 20-foot ceiling. Computer screens display artwork on the interior walls of the mansion, and occupants can change the images that appear on the screens at the touch of a button.
As of 2013, the value of the private art collection of music and entertainment magnate David Geffen is over $1 billion. Other billionaire art collectors include Walmart heiress Alice Walton and hedge fund manager Steve Cohen.
Sheikh Hamad bin Hamdan al Nahyan, a member of Abu Dhabi's ruling family, is one of several Middle Eastern billionaires famous for his affinity for automobiles. As of 2011, the Sheikh's car collection featured more than 200 vehicles.