"Mona Lisa" (1970) by Maciej Urbaniec does not have a political message, but rather a social one. The combination of Mona Lisa's head on the body of a contortionist connotes the idea that in the perfect society, high art (such as that of Leonardo da Vinci) would be combined with the more popular art of the circus - accessible to all.
"Elephant on bike" (1972) by Waldemar Swierzy is another great poster which combines several hidden messages. The large red elephant (USSR) attempts to stay balanced on a tiny bike - it's only a matter of time until he falls. The two acrobats at the bottom are identical, mirror-images. This was used by Polish artists to say that the Communist government was double-dealing and not to be trusted.