This striking 12 złoty commemorative stamp from Poland (1982) honors Zygmunt Janiszewski (1888–1920), a renowned mathematician and co-founder of the Polish mathematical school. Designed in a modern pixel-grid style, the portrait uses cool blue tones and bold contrast to emphasize Janiszewski’s intellectual legacy. Issued by PWPW, the stamp reflects Poland’s tradition of celebrating cultural and scientific figures through contemporary graphic design. A desirable item for collectors of Polish history, mathematics-themed philately, and 1980s commemoratives.