Karl Oskar Blase (1925–2016) was a German graphic and poster designer, renowned for his innovative work in the field of cultural and advertising posters. Born in Hanover, he made his mark on the history of graphic design with his refined style, his keen sense of typography, and his minimalist approach. Trained at the Hanover School of Fine Arts, Blase collaborated with major cultural institutions, including the Theater Hannover and the Folkwang Museum in Essen, for which he created posters that have become iconic. Among his most famous works are the posters for the Folkwang Museum exhibitions in the 1960s and 1970s, where he captured the essence of works or events in a few strokes. His work is distinguished by his bold use of color, simple geometric shapes, and an economy of means that reinforces the impact of his message. Blase also taught graphic design, influencing a generation of designers. His legacy lives on through his posters, exhibited in museums around the world, and his timeless approach to design, which continues to inspire contemporary graphic designers.