After the death of the designer referred to in the previous question, ______________, a professor at the Warsaw Academy of Fine Arts, became the spiritual head of Polish graphic design. His posters, such as the football poster for the Olympic Games in 1948, were composed of bits of torn and cut paper, then printed by the silkscreen process. He led the trend toward developing an aesthetically pleasing approach, escaping from the somber world of tragedy and remembrance into a bright, decorative world of color and shape.