No, it’s not being done to test craziness levels. It is being done to help establish more interesting aspects to the cities inhabiting the story world of Book 1.
For the city used to inspire the capital city of Book 1’s country, a Wikipedia search was conducted. The information that stood out the most to me was that the city is “one of the largest cities built almost entirely out of adobe”.
OK, adobe. Well, acrobat is closely associated to the word adobe these days. A well-known acrobatic form these days is Parkour.
A multi-layered city designed with Parkour in mind? That would be awesome for many reasons:
The world’s army can be trained to be Parkour types. Ninjas but not…
The world’s architects can have fun designing city districts so Parkour travel is possible.
The city’s residents can keep themselves entertained (especially those energetic kids) by exploring the city in such a way.
I want to live there already *sigh*