In the case of real-time interactive computer graphics, usually a user is in control of what is about to be drawn on the display screen; the user typically uses an input device to provide feedback to the system—for example, wanting to move a character on the screen—and the system decides the next frame based on this particular instance of action. Usually the display is far slower (in terms of the number of frames per second) in responsiveness than the input device (in terms of the input device's response time measured in ms). In a way this is justified due to the immense difference between the infinitesimal response time generated by a human-being's motion and the very slow perspective speed of the human-visual system; this results in significant advancements in computer graphics, whereas the advancements in input devices typically take a much longer time to achieve the same state of fundamental advancement (e.g., the current Wii Remote), as these input devices have to be extremely fast in order to be usable.