Ever since my engineering drafting classes in high school (a thousand years ago) I've been a fan of repetitive lines, and this one is an awesome (and I don't use that word lightly, like the ubiquitous and annoying "OMG") example. So good to see you submitting again, John.
If you've ever wanted to make a difference but found it hard to believe that one person could... check out the Kiva Team Caedes discussion thread and discover that anything is possible.
I think your protractor is broken, I can't find any right angles anywhere in this photo. :-) A great perspective in the photo and good angles and lines in the image.