Two things that interest me are history and the use of imagery to shape ideas. When imagery is used for purposes to change peoples views, it goes beyond advertising and into the realm of propaganda.
During the Second World War, the movement of women from the role of homemaker into an active participant on the homefront was a common theme on all sides. As the men were sent into combat roles, the women were moved into roles of conservation of resources, actively joining the production of armaments, and into the military as nurses. Below are some famous propaganda pieces in this vein that demonstrate this common theme across the board.
American propaganda poster encouraging women to get a job
Famous American poster featuring "Rosie the Riveter"
Yet another American propaganda poster
This poster was displayed across the United Kingdom
German propaganda poster urging conservation.
The USA had similar ideas on display as well, urging to "Make do".
Meanwhile in the Soviet Union . . .