The 1970s was “the golden age of ergonomics and ecology, the idealisation of natural materials, the hegemony of realism in art”. Plaano chair was designed in this age. Kukkapuro was the first person to use physical symmetry on chair’s design, to study different people’s sitting shapes, after understanding people’s body shape when sitting, and the physical characters, then via backrest, headrest, neck-rest, three independent parts to design a chair which can fully support people’s body, the perso