Every kata (形) has two distinct roles called uchidachi (打太刀) the striking/attacking sword and shidachi (受太刀) the doing/receiving sword. Some parts of the kata are identical for both roles, like the kamihanen (上半円) upper semicircle and shimohanen (下半円) lower semicircle (also called "johanen" and "gehanen"). These are unconventional waza (技) techniques and characteristic for this style. Roughly, the swordsman draws a semicircle (upwards or downwards) with both his right hand (holding the sword), and his left hand (free). He finishes the movement with his arms extended, the sword pointing upwards, and the free hand's index finger pointing downwards. These movements can be considered as a greeting and a form of meditation, and are usually executed in the beginning and end of a kata or suburi (素振り) session. They represent all the things in heaven and all the things in earth, and the practitioner in the center of everything.