There are a variety of basic machines in the bathroom. Levers, pulleys, and inclined planes are all examples of mechanical devices. The bathtub is one example. It is an inclined plane that directs the water to the drain. A faucet located at the end of the tub allows you to control the flow of water. The toilet is another example of a mechanical device. It consists of an air-tight tank attached to a base with legs. You flush the toilet by pressing on a handle or button which opens a valve allowing water to fill the tank. When you release the button or handle, it closes this valve and stops the flow of water. The weight of this water raises the lid on the tank, which lifts the seat to create a void below it. This prevents any more water from entering the bowl when the tank is full. Bathtubs and toilets work on similar principles: An object is used to open and close a valve so that water can be directed toward one side or the other. From there, it will continue to flow until something stops it. These are just two examples of many simple machines found in the bathroom. Simple machines are easy to build and fun to experiment with. There are many different ways to use simple machines in your own bathroom design.