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Until the advancement of modern times, this discipline was confined entirely to the study of magic's ability to influence photons, making it the prime discipline for navigators and artists as it manipulates light, and to many cultures was considered a 'divine' discipline.
As modern science grew, and the understanding of the Electromagnetic Spectrum grew — so too did scientists notice that magicians could influence different parts of the entire spectrum, including Visible Light, Ultraviolet and Infrared, and even in some more late-discovered magical forms could cause effects contaminating radio frequencies.
In pre-modern times, those practicing were almost perfectly split into artists who focused on the craft of illusions, and explorers who could use their spells over light to do all from light their paths to momentarily blind aggressors.
While this discipline can, in theory, affect the entire EM spectrum from radio-waves to x- and gamma-rays — the needed common points to cover the entire spectrum are unknown, so it is split into its two understood trees.