The art is one of the intresting expressions for psychological states. You can explore the psychology of the artist itself or- even more intresting- the public's psychology in a certain time and place. For example, you can see how the art was influenced by a certain war or other crisis.
You can look after symbols in the art- works or after the main issues in the works, the colors or the figures. I would recommend you to use the theory of Jung about the collective uncouncious.
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