Abstract: A variable force keyboard may include a keyboard box, a plurality of keys operatively connected to the keyboard box for movement relative to the keyboard box, and, for each of the plurality of keys, a resistive force may be provided that opposes movement of the corresponding one of the plurality of keys. The resistive force may be applied by key springs or other like structures acting on the keys, or the keys may be resilient structures such as cantilever springs that resist displacement. The variable force keyboard is configured to model a graphical, mathematical or physical relationship by varying the resistive force on each of the plurality of keys to correspond to values of the graphical, mathematical or physical relationship modeled by the variable force keyboard.