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My name is William Gozali, born in the 90s in Indonesia. On internet I am known as gyosh, or gyosh_ if the username has been taken. I purposely pick gibberish for handle but surprisingly still have this problem.

I have started to be interested in origami since kindergarten and started studying complex origami in 2013. This art form fascinated me because it is a blend of science and art.

Professionally I am a software engineer, although without specific specialization. Currently just doing general scripting to automate data processing. I have another blog about data structure and algorithm (but it is all in Indonesian):

Besides origami, I enjoyed:
  • Natural history, by watching documentary film or reading encyclopedia about wildlife
  • Playing Rubik's cube, at some point I was sub-23 seconds
  • Studying and reading maps
This blog is dedicated for knowledge sharing on origami, as I have received much knowledge from my fellow paper folders.

To benefit from this blog, you would need to understand the basic of origami design. These can be learned from:
  1. "Origami Design Secrets: Mathematical Methods for an Ancient Art", by Robert J. Lang. The book is long, but it is the most complete textbook for origami design so far. Anybody who wants to design origami has to read it.
  2. "Origamix - Theory & Challenges", by Tetsuya Gotani. Much thinner in content, but provides more modern approach in origami design. This book complement Origami Design Secrets.
  3. "Genuine Origami: 43 Mathematically-Based Models, From Simple to Complex", by Jun Maekawa. This book doesn't provide design method in depth, but gives explanation on math and geometry in the design. The models featured here are elegant and purely paper folding; it looks origami-like and can be folded without sizing agent due to clever locking mechanism.


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Warped and Wrinkled Paper Curse

After starting using Carboxy Methylcellulose (CMC), I began to wonder if my setup wasn't right. The problem was my double tissue would always peel itself when drying. There will be high pitched popping sound from the paper every now and then. Finally it would be completely off the surface. Whereas on every tutorial I saw, the paper will still stick to the surface and we have to peel it off. The bad part is the paper will be warped; it's not flat. It is difficult to fold a straight line on paper like this. Imagine precreasing a grid or locating references when your fold can be bent due to the paper's bump. I have theory on why the warp happened. Before going to that, it is important to know that: When a paper is wet, it expands. When it dries, it will return to the original size. However it will keep its shape when it is wet, meaning that if it is bent when wet, it will retain that bend when dried.  When my paper dried partially, that region will shrink. This created differe

Origami Ibex

Ibex is a type of wild goat found on Eurasia and North/East Africa. Easily identifiable by its long curved horn full of ridges, which is what I'm trying to express here. Nubian ibex is vulnerable to extinction due to competition with livestock and habitat loss. Ibex has been nearly extinct multiple times in the past because of hunting and unable to compete against livestock. The most recent extinction was Pyrenean ibex, in the year of 2000. Image source: I want to make my model to be instantly recognizable as an ibex, not a goat. Horn ridges are rather specific for ibex, so I tried to represent that with spike structure commonly used on insect legs.

Origami Helmeted Hornbill

Helmeted hornbill is a huge hornbill with round casque, featherless throat, spiky hair, and two very long tail feathers.  Unlike other hornbills, its casque is solid and for some reason some people like it. It is sought as valuable item just like elephant's tusk. Overhunting has driven them to be critically endangered. This is the most challenging subject that I've attempted so far.