Ryujin 2.1 (Satoshi Kamiya)

Folding the Ryujin 2.1 is an incredibly complex process that can take expert folders anywhere from 20 to over 40 hours to complete. It is one of the most famous and intricate designs by Japanese origami master Satoshi Kamiya. The model requires massive sheets of paper, often a 50cm x 50cm square or larger.

Due to the extreme density of the model, folders typically use custom, ultra-thin paper like double tissue paper or 'origamido' paper. These materials allow the paper to be folded hundreds of times without cracking or becoming too bulky. The paper must also be treated with methylcellulose to retain its shape and rigidity.

Yes, the Ryujin 2.1 is an advanced example of pureland origami, folded entirely from one single, uncut square of paper. The complex scales and claws are all formed by meticulously collapsing the paper according to a massive crease pattern. This strict adherence to a single square is a hallmark of Kamiya's design philosophy.

Satoshi Kamiya published the intricate crease pattern for the Ryujin 2.1 in his 2005 book, 'Works of Satoshi Kamiya 1995-2003'. There are also numerous unofficial video tutorials and diagram breakdowns available online from advanced origami artists. However, the actual folding sequence remains a closely guarded challenge for most enthusiasts.