I did this post-sketch analysis of the Fine Arts Building in Chicago to explain what I saw at the time just when I started to sketch it. In the class I taught for Sketchbook Skool 2 weeks ago I explained the process of doing thumbnails but I have a more elaborate process – my seven step system which I explain in SketchingNow Buildings.
In fact it had a more complicated grid and more variations that I intially observed and it would have been better for me to have done a little more analysis before I started! It would have been a perfect subject for using my seven step system. But, oh well, you live and learn!
If you are interested in my Buildings course, I have opened it up to early registration (and special earlybird pricing too!) for people of the waiting list. You can still join it here but you have to do it in the next 36 hours.