Those who follow the ideology of Nordicism and Germanicism only consider Northern European people who are Nordic or Germanic (and often Celtic) to be white, shunning Southern and Eastern Europe along with anyone whose ethnic heritage is not European. In Madison Grant's 1916 book, The Passing of the Great Race, Europeans who were not of Germanic origin and had Nordic characteristics such as blonde hair and light eyes were considered to be a Nordic admixture and suitable for Aryanization. These beliefs were central to Nazism and lay at the core of the Nordic theory.