*The works in "sign - B" and "sign - C" are a series, so they have the same concept. The theme of this work is visual perception and language. The acrylic board is used as the base material and the screen-printing technique is utilized. We are inseparable from language. The world changes considerably depending on how we perceive, understand, and use the language we receive. In this work, I used the characteristics of the work, such as the way it changes in appearance depending on the angle and the imaginary reflection of the work in a mirror due to the mirror finish on the back of the work, to examine what kind of existence language has for us. I would like to explore the "invisible existence inside" that cannot be seen from the surface.