 Extended further, it also embraces the concept of Kyo-jitsu (emptiness-fullness of Ki).These momentary lapses of mind, and Kyo-jitsu, we may call the 'kokoro-no-maai' (mental interval).The implication of kokoro-no-maai is that although the physical distance between opponents may be mutually advantageous, the mental interval possessed by individuals will determine who will have the decisive advantage.