Perspectiva commvnis : ideo sic dicta, quod contineat elementa tes optikes, omnibus philosophiæ studiosis necessaria : in hac enim doctrina inchoatæ disputatioes philosophoru, de natura, & proiectione radiorum unisus, luminum, colorum & formarum absoluuntur : in quibus & de speculis tractatur : summa cura & dilgentia emendata, & ab infinitis quibus scatebat mendis repurgata, necnon in quibus deficiebat demõstrationibus restituta
A Latin textbook of optics, written by the thirteenth-century scholar John Pecham and re-edited by Georg Hartmann for students of philosophy, printed at Nuremberg by Johann Petreius in 1542. The illustrations are small woodcut geometry diagrams printed on laid paper: circles and semicircles crossed by straight ray lines converging to points, with letters marking angles and reflections, usable as line-art motifs, page ornament, or scientific-diagram texture.
