This is a very small diptych- the inspiration to do it as a diptych came to me after seeing a friend's painting. Check out his website- http://www.spgoodman.com/
I once had a teacher who wondered why you would do a diptych, and not just a single canvas. In this case, I feel like it is joining neighbors together- each canvas primarily containing a single house. I also, however, like the joining of parts that you accomplish with two instead of one.