Before the era of the defined parquet, the wooden floors of the past were assembled in the rough, and after having glued them to the ground they were plastered, sanded and then dyed or painted with a transparent finish. The pore of the wood was rather poorly receptive, as the sanding smoothed it to the point of closing much of the natural capacity of absorption of liquids. It goes without saying that the protection, which was applied by roller in the case of paints or cloth (or with special machines) in the case of oils, was rather a "plastic film" in its final effect (a little less with oils, because impregnating penetrated better the wood fiber emphasizing the natural design). Nowadays wood is defined, that is to say varnish the parquet and define it before laying, stave by stave, so that it is also possible to obtain particular effects such as decay and hand planing or the saw plane effect (but these are themes that we will examine in more detail in the future). How the brush