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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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Origami Condor v1.2

Got an idea to improve the design while commuting. Change log from previous version : Extra row of feathers (coverts) Curved the secondary feathers' terminal edge Slots on primary feathers are now monotonically decreasing in size Here you can see the comparison: Before vs after

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

The Foolproof Way to Divide Paper Into N'ths

We all have been there... asking how to divide paper into 14ths or 15ths and occasionally got the answer of "just make 16 grid and cut it". Another scenario is being terrified with prime number division like 13ths or 17ths. In reality it's not that difficult. This post will share how to make such division just inside your head so you can start folding right away. I promise it won't require any arcane maths.