For you really bright observers you can see the rendering below is not a pergola, this is the replacement for the pergola. As mentioned in previous post this week the thought was pergola for the large open area but that idea was blown quickly out of the water. The owner wanted nothing to do with a pergola.
In this part of the country there are several old farm/barn buildings that are partially standing. These old structures are usually out in a field surrounded by overgrown brush, or nestled into an old grove of trees, often times Locust or Black Walnut trees.
[This color rendering will be shown to client]
I am hoping this drawing will give the owner a good idea of what I am trying to achieve. Why did I draw this angle?
- I wanted to get away from the standart straight on look
- There was no reason to do a sectional drawing because there are no issues near the ruins that need to be shown
- Perspective . . . this 2 point seems a more powerful way to get the viewer interested in the scene, showing the 2 walls brings depth to the scene . . . I think.
- Showing the view as though the observer was underneath an old locust tree; to me, brings you right into the scene . . . you’re there! After all I/we are trying to sell this as an option to what’s there . . . nothing.
- Lastly . . . it’s fun!
The rough sketch was my initial drawing for the scene. I thought the angle along the top of the walls was a little too severe and backed off that in the color rendering. All the wacky marks along the lower edge were me determining which ink line to use for the shrubs along the base of the wall. I just couldn’t decide on line weight.
The key to remember is the ruins are the focal, and deserve the focus . . . but . . . I am trying to sell the entire scene, It is the designed space in its entirety that will either make or break this space.
The Whispering Crane Institute 
There is a rich history of this kind of thing in 18th and 19th century Britain and Ireland. Thousands of follies were built by landlords to create what you talk about. Some of these are amazing. I worked on one estate which had a man-made lake, islands with stone ruins, a temple, boat house, eel house and more.
Views through openings like you have drawn were popular, sometimes arched and often framing a distant view. This concept of framing seems to have been important. Wall tops were often ragged and not level or straight.
This trend or fashion disappeared but I have heard of its revival at a famous rock stars residence, with a ruined bridge etc.
Originally I think you brought your visitors around your estate and these were talking points, a place to stop or maybe to take out your easel and paint or write a poem. It is interesting to see the concept return.