And, of course, kirigami is always therapeutic.
33: I came up with this after staring at some Masahiro Chatani models on the Internet. It was supposed to be more complex, but I was off at the start by a few centimeters, and that affected how much room I had for more layers.
In general, I work in centimeters and half-centimeters; any smaller can get hard to fold.
34: This one was more messing around than an exercise, but the nesting arch trick here helped me figure something out for a card/letter I made for my brother later that week. (I guess I did have a new idea. But since it's personal, I'm not going to post photos of it here.)
35: This was another exercise I set for myself after looking at Masahiro Chatani models.
Folding adjacent stairs like these needs some care; you can see diagonal bumps where the staircase in front pulled on the one in the back.
36: I saw some photos of Chand Baori, which appeared in that really gorgeous Tarsem Singh movie, The Fall, as well as in The Dark Knight Rises. Yes, yes, more stairs.
The difficulty I had with this model was measuring the base. I wanted stairs all the way to the base, but again, I had some measurement problems. You can also see some wrong creases at the base due to those problems.
While it looks nice, I'm not fond of horizontal models that go so far out from the spine; if the paper is soft or becomes soft (e.g. from moisture or from someone sitting on it by accident), it starts to collapse in on itself.