 The mathematical properties of the decorative tile and stucco patterns of the Alhambra palace in Granada , Spain have been extensively studied . Some authors have claimed on dubious grounds to have found most or all of the 17 wallpaper groups there . Moroccan geometric woodwork from the 14th to 19th centuries makes use of only 5 wallpaper groups , mainly p4mm and c2mm , with p6mm and p2mm occasionally and p4gm rarely ; it is claimed that the " Hasba " method of construction can however generate all 17 groups . 
