1. A system for scanning, tracking, engraving, printing, plotting, writing, or reading, comprising: (a) a polygon means rotatable about a rotational axis throughout a range of rotation with a first angular velocity, said polygon means comprising a polygon having at least one side, said side including at least one optical means; (b) a radiation source means for providing a plurality of radiation beams having a plurality of relative orientations and directing said plurality of radiation beams onto said optical means of said polygon means, such that said plurality of radiation beams travel to said optical means of said polygon means; (c) a medium support means providing a medium having a region; (d) said optical means arranged to project said plurality of radiation beams from said optical means onto said region to form, on said region, a corresponding plurality of radiation spots which move on said region at a second angular velocity about said rotational axis of said polygon means, said second angular velocity being linearly proportional to said first angular velocity; (e) said region being positioned to receive said plurality of radiation beams from said optical means of said polygon means, such that said plurality of radiation beams travel along an optical path from said radiation source means to said optical means, and then to said region; (f) said radiation source means and said region being positioned so that they are spaced from said rotational axis and are spaced from each other; and (g) a relative movement means for moving said plurality of radiation beams parallel to said rotational axis.