Then comes the realization of the decorations that characterize the vases of different Neolithic groups. On the Ensisheim group vases, it consists of ribbons, engraved in fresh clay using a pointed tool, first curvilinear [detail b], then angular [detail c], often embellished with ancillary patterns such as hyphens and dots. The cooking of the vases, after drying, is always a delicate operation, especially at a time when the furnaces remain to be invented. The operation lasts several hours and takes place on the ground or in a pit, with a fire regularly fed with wood. In this case, the ceramics are arranged in the bottom, then covered with branches. To prevent them from bursting, the potter must ensure a gradual rise in temperature up to 500 or even 800 degrees. The same goes for cooling the pottery: it must be slow, which is not obvious. The fire is regularly fueled with wood.