In this comparison, I explained details on specific categories in Unwind by Neal Shusterman, Cinder by Marissa Meyer, and Replication by Jill Williamson and gave each topic a different color.
I then created a triangular diagram to compare the main themes. On the triangle, I typed the name of each book on each point. I then summarized each topic, corresponding to its color in the table, and placed it between two of the points on the outside of the triangle. Whichever points on the triangle the text is between relates to which two books shared this quality. In this way I used the diagram to make connections among these three books.