a suggestion for the unity

I found these images above via google. Some junctions seem interesting. However, in my opinion, important thing that we have to think about bird houses at first is not these junctions but the overall look of our houses when they are connected together. Thus, I guess that we have to set a basic shape or style of houses such as modern looking or more traditional looking for unity. 

What I mean is letting some restriction of shapes of our houses.... I am not sure that my words are delivering my words for sure.. 

These images are kinds of modern looking bird houses. 




Anyway, I want to say that there have to be unity and after the unity, we can put our small details in it.