A brief reading of the sentences shows that the paragraph must be about the interplay of the artistic and aesthetic in determining the impact of artistic work. 4 properly introduces these two components and builds a foundation for further discussion. 3 refers to the polarity mentioned in 4, and then asserts that neither of the two components alone suffices to determine the value of a work. 2 builds on this assertion and says that the convergence of the two brings the literary work into existence. 1 then further talks about the matter saying that the realization aspect further depends upon the individual disposition of the reader. Thus 4321 is a coherent paragraph.