The project comes from a collector’s desire to preserve some traces of the twentieth-century nature of his new home. The domestic space is articulated by a concrete threshold that separates the living room from the study through a transitional system that generates spatial autonomy. Thickness amplifies the rituality of crossing from one room to another while altering the domestic and architectural scale. The concrete threshold is an autonomous space that supports all the plant equipment contained in its lintel. Each room is recognizable by a differently colored grit carpet that figuratively isolates the perception of one room from another.