Pictorial decoration is the art embellishing any bearing: walls, wood, canvas, paper, glass, pottery… In great noble palaces it added prestige, it was filling up and served as furniture. Various old techniques are still used today in order to decorate walls, furniture, ceilings…, i.e. fake stuccoes, fake woods and woodworks, fake marbles, fake damasks, grisailles, encaustic, stencil, trompe-l’oeil. As to the use of colour, all these may be executed by means of ancient or modern techniques. Decoration still embellishes our small and great homes, totally transforming a room just by a few touches. “Tromper”, to trick or to deceive in French: we have examples of this technique ever since ancient Greece and the Roman age. The trompe-l’oeil is a decorative pictorial technique which, through expedients such as the shadow play, the perspective, the light, gives the observer the illusion that he/she is looking at real and three-dimensional objects, painted though on a two-dimensional surface.