Because iaido is practiced with a weapon, it is almost entirely practiced using solitary forms, or kata performed against one or more imaginary opponents. Multiple person kata exist within some schools of iaido; consequently, iaidoka usually use bokken for such kata practice. Iaido does include competition in form of kata but does not use sparring of any kind. Because of this non-fighting aspect, and iaido's emphasis on precise, controlled, fluid motion, it is sometimes referred to as "moving Zen." Most of the styles and schools do not practice "tameshigiri", cutting techniques.