His series Rozstrzelania / Executions, dating from the end of the 1940s, provides some good examples of this type of composition. These scenes of events during the German occupation of Poland are exceptional for the intensity of feeling they provoke. The artist accomplishes this by depicting brutally deformed human figures torn into pieces; at the same time the canvasses are maintained in cold, blue-green, cadaver-like hues. Around this period the artist produced other paintings in which he used the symbolism of blue as denoting non-materiality (Syn i zabita matka / Son and Dead Mother, Matka z zabitym synem / Mother and Dead Son, Zabity maz / Dead Husband). (http://culture.pl/en/artist/andrzej-wroblewski)