Art Appreciation Question is driving me crazy?

I can't figure out how to start to answer this question, if anybody could give me a nudge in the right direction or knows any good websites that would be awesome. I will pick a best answer for incentive.

The inner landscape of the human mind was the subject of much art produced in the late 19th and early 20th centuries. Discuss, from a perspective of cultural history, some significant reasons why this was the case and illustrate your discussion with several illuminating examples.
 
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