The changing rooms of the thermal baths of the villa of Damblain (Vosges) received a decoration of painted plaster very neat whose linear patterns in bright colors stand out on a white background. This decoration presents a linear composition in orthogonal network, formed on the width of two yellow octagons. The study of these fragments has allowed us to observe in some cases the use of a metal stylus to trace the decoration, and in particular the circles made with a compass.