This work was designed for an exhibition with the theme "GO". The Japanese word “go” has several meanings and I selected “5” among them. The design of the surface incorporates "5", using "5" types of wood, and developed as the "fifth" of the bar box series. Based on the previously created "Barsbox" to "Bars Box IV"（KW-36～KW-39） I have also introduced new mechanisms. This work starts with the design of the surface but there are mechanisms that betray your expectations.