The Berlin and Red Blue Chair designed by Gerrit Rietveld have been subject of academic study. They are a symbol of Neoplasticism and De Stijl, with a powerful compositional synthesis of geometric and chromatic modulations. For these reasons the chairs became the starting point of an interpretive path at University level linked to space (metaphor of the dihedral of Monge) and to the relation concerning body (in its postural and behavioural logics) and perception (between synaesthesia and symbol). A gaming path has been conceived by means of understanding activities (design/survey) and directly dealing with the shape: this means analysing objects by their physical rebuilding in laboratory models. Starting from the rebuilt model it is possib...