More common appliances include water filters and various home security devices that detect intruders, smoke, and carbon monoxide. Entertainment advancements include video games, surround sound systems, and even the broadcast of television. The benefits of America's space program can be found just about everywhere. Not surprisingly, the comforts we are accustomed to on Earth are vital to living and working in space. The International Space Station is a set of connecting cylindrical tubes.
Storage is at a premium, so the sides of the tube house storage racks.
Because there is almost no gravity in space, astronauts float and need strong visual cues for orientation. Lights are used on the upper section, adding a natural sense of brightness and light. Because the power source for the space station is solar power, the lighting levels are somewhat low, so the use of color is important for brightness, for contrast, and to reflect light. Blue is used on the deck. Windows are provided in the crew quarters and laboratories to help with relaxation and to reconnect with Earth.