Anyone who has attended a Morihiro Saito Sensei seminar will remember how the master often referred to a small illustrated manual written by Morihei Ueshiba. He would open this booklet to the page pertaining to the technique he was explaining, walk past each pupil to show it to them and repeat: 'O'Sensei. O'Sensei", as if to validate his technical explanation with the seal and approval of the supreme authority: Morihei Ueshiba, the Founder of Aikido.