 This "metaphysic of light" inclined Witelo to optical research, or perhaps "vice versa" his optical studies led to his metaphysic.According to the Polish historian of philosophy, Władysław Tatarkiewicz, no Polish philosopher since Witelo has enjoyed so eminent a European standing as this thinker who belonged, in a sense, to the prehistory of Polish philosophy.From the beginning of the fifteenth century, Polish philosophy, centered at Kraków University, pursued a normal course.