The work of Guralnick along with the previous studies by Erik Iversen and Kim Levin have added considerably to the argument for an imitation by Greek sculptors of Egyptian sculpture. The system of proportion in the second Egyptian canon of the Saite period consisted of a grid of twenty-one and one-fourth parts, with twenty-one squares from the soles of the feet to a line drawn through the centre of the eyes. The grid was applied to the surface of the block being carved, allowing the major anatomical features to be located at fixed grid points. Iversen has shown that the New York kouros conforms to this ratio of proportion. It was Guralnick, however, who developed this discovery by comparing other kouroi by means of cluster and Z-score profile analysis to the Egyptian Canon II and a control group composed of statistically average Mediterranean men. As a result, she has identified two strains within methods of proportioning in sixth century kouroi, where the majority follow the general line of evolution from the foreign model towards an idealized human norm.