Which artist is known for their work called 'The Fifties'?

The artist known for their work titled 'The Fifties' is Sigmar Polke. This piece reflects the socio-political landscape of the 1950s in West Germany, a time marked by post-war recovery, cultural shifts, and artistic experimentation. Polke was influential in the development of postmodern art and often employed unconventional materials and techniques in his works, pushing the boundaries of traditional painting.

His approach in 'The Fifties' showcases a blend of various styles and a critical engagement with the themes of consumerism and mass media, which were becoming prominent in that era. This work exemplifies Polke's unique ability to merge personal expression with broader cultural commentary, making it a significant piece in understanding the evolution of contemporary art in the 20th century.

The other artists listed are notable figures in the art world, but they are associated with different styles and periods. Gerhard Richter is known for his abstract and photorealistic works, Piet Mondrian is famous for his geometric abstraction and contributions to the De Stijl movement, and Jackson Pollock is recognized for his drip paintings and as a leading figure in Abstract Expressionism.