Aiki (martial arts principle) and its practice is often kept within a particular individual or two from a family/school lineage. Culturally, and due to certain necessities of the time period, the aiki knowledge was usually a very well guarded secret and rarely disclosed. The oldest book to have historically discuss aiki was the 1899 Budo Hiketsu-Aiki no Jutsu. On the subject of aiki it was written: The Textbook of Jujutsu (Jujutsu Kyoju-sho Ryu no Maki) from 1913 wrote: Aiki (martial arts principle) Aiki from a Japanese budo term, at its most basic is a principle that allows a conditioned practitioner to negate or redirect
Japanese bondage (in the same way as there are 'Diamond knots' and 'Portuguese Bowline Knots', but 'knotting' does not mean bondage). Instead, Kinbaku is the term for artistic or erotic tying within traditional Japanese rope bondage circles. This view seems to be squarely at odds with the way the word is actually used in books, periodicals, and discussions of rope bondage among Japanese. An even more traditional view is that shibari is a term used for erotic bondage in Japan that is practically interchangeable with the term kinbaku. Itoh Seiu (generally considered one of the fathers of contemporary Japanese rope bondage) used