In 1864, James Maxwell developed a theory stating that all forms of radiation were the result of electric and magnetic fields that propagated through space as waves. This type of radiation is therefore collectively called electromagnetic radiation. The electromagnetic spectrum includes the radiation of microwaves, radio signals, ultraviolet and infrared. Visible light represents only a small portion of the electromagnetic spectrum. This module models the visible spectrum providing information including the wavelength, frequency and photon energy according to the mouse's position on the spectrum. On Windows-based systems with limited color resolution, the spectrum will not appear smooth.