I have developed a teleoperated android of myself, which is called Geminoid. Both of the visitor who talks with the geminoid and the operator who operates the geminoid adapt to the geminoid. The visitor recognizes it as me and I, the operator, recognize the geminoid body as my own body. This unique robot system is not only state of the art technology, but also a platform to study cognitive science and philosophy. This paper introduces various phenomena in the use of the geminoid and discusses the philosophical meanings.