Synthetic construction is an artificial territory manufactured by the confrontation of geometric shapes and a spill of formless matter. This material, which is however made of materials with which Architecture is built: stone, cement (coloured) and earth belongs to a different register, a register of plastic order. However, this matter which collides with the geometric form participates as much in dividing and levelling the space or in creating confined zones. This project is on a dividing line between Architecture, Sculpture and Painting. It is a specific unidentified object and yet it offers a commentary on the two elementary components of Architecture: space and matter.