 Islamic Girih tiles in Islamic architecture are self @-@ similar tilings that can be modeled with finite subdivision rules . In 2007 , Peter J. Lu of Harvard University and Professor Paul J. Steinhardt of Princeton University published a paper in the journal Science suggesting that girih tilings possessed properties consistent with self @-@ similar fractal <unk> tilings such as Penrose tilings ( presentation 1974 , predecessor works starting in about 1964 ) predating them by five centuries . 
