This is a ninja escape technique that allows the user to control how light is reflected around their body with chakra inflections. The technique also erases the user's scent and shadow, and is usable on any terrain, making it ideal not only for covert manoeuvres but also offensive strikes. Perceiving the user's position is possible only for ninja who are astute enough to observe minute variations within their surrounding environment, such as distortions of air currents in the immediate vicinity or distinguishing sounds, i.e. footsteps etc. The usefulness of this ability can be entirely negated by those with special vision or sensory skills, except for particularly adept users, who can completely erase even their chakra signature with it.
The Second Tsuchikage, Mū's mastery of this technique helped earn him the moniker "Non-Person" (無人, Mujin), seemingly having neither form nor chakra while the technique was active. Thus, he could not be sensed through traditional means.
Despite that this technique erases the user's scent, when it was used by Karenbana, she was discovered by Sakura Haruno due to her wearing too much perfume.