Bukkaigan

The also known as the  is reputed to a symbol of a wisdom beyond words and true suchness. Among the residents within the Land of Demons, it is considered a rather deified eye and one that signifies that an individual has transcended from Six Spiritual Realms, The Three Realms of Evil and the Three Good Roads and has entered a state pure wisdom. In history, this symbolic third eye has manifested itself in one other entity whose name has been buried by the sands of time though not forgotten in spirit. It is said that an individual who attains the transcendent Bukkaigan have an innate understanding of form, formlessness and the ability to peer beyond the true complexity of consciousness. This eye is characterized by a constant flowing, seamless, gradient of soft pink, purple and blue that covers the entire eyeball.  http://vignette1.wikia.nocookie.net/narutofanon/images/5/58/Akuhyo_Logo.png/revision/latest?cb=20170304091420