 Some authors have claimed on dubious grounds to have found most or all of the 17 wallpaper groups there.Moroccan geometric woodwork from the 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" (measure) method of construction, which starts with "n"-fold rosettes, can however generate all 17 groups.The earliest geometrical forms in Islamic art were occasional isolated geometric shapes such as 8-pointed stars and lozenges containing squares.