literary complexity

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Some days ago I saw a thread where multiple people described someone's favorite works as "good, but basic". That inspired me to think about what makes literature complex.

I only read literature either for fun or for cultural awareness and I don't consider whether a work would be complex before I choose to read it. I rarely read something, understand it and consider it "complex". Now I'm wondering if I'm missing something. Can /lit/ give an example of a complex work they have read and give a brief explanation for why you think it is complex?

Here are some works I thought were difficult to grasp:
The Stranger - for it's ambiguous message and character intentions
Paradise Lost - for it's heavy use of references and difficult language comprehensibility
Arabian Nights - because of the cultural disparity
A Treatise of Human Nature - not /lit/ but still a good example. "A cause is an object precedent and contiguous to another, and so united with it, that the idea of the one determines the mind to form the idea of the other, and the impression of the one to form a more lively idea of the other." I can read this, but it takes my full concentration and much backtracking and have to rely on commentary at times.