A year ago , the wife of the Oxford don noticed that the pattern on Kleenex quilted tissue uncannily resembled the Penrose Arrowed Rhombi tilings pattern , which Sir Roger had invented--and copyrighted--in 1974 .
It has been recently found out a similarity between the pattern on the recent Kleenex quilted tissue and the one of the Penrose Arrowed Rhombi tilings , which may have been copied even though it was under copyright .