They are constructed with pieces of brick forming a vault and later rendered over with mortar.The smallest elements on the terrance are the chimneys, which are organized into seven groups. They rise up surrounding the patios eliminating the fumes from the kitchens and flats and the heating boilers in the basement.The chimneys have an ochre color finish.Of very similar shapes, Gaudi created the chimneys parting from a curling trunk and crowned with a cowl.