At least in theory, Jews were darker -- dark hair color and eye color -- as opposed to the Aryan (non-Jew) ideal of the tall, blond-haired, blue-eyed Northerner common in Scandinavian countries; and some photos, such as the classic one of Anne Frank, show such darker features in Jews. However, by this time many Jews in western and central Europe were quite secular and had intermarried with Gentiles, so not all Jews had that classic darker look; and many non-Jews also had darker hair and brown eyes. Short and dark-haired Hitler did not even meet his own Aryan ideal. In practice, the Nazis identified the Jews by first requiring them to register as such, a type of census of their ancestry. They would claim it was just some routine, unimportant thing, and the law-abiding Jews complied with the law. Then after obtaining this registry information, the Nazis gradually introduced laws restricting the activities of Jews, requiring them to put up signs in front of their shops telling that they were Jew, and finally requiring that the yellow Star of David be sewn into their clothing. Throughout it all, most Jews were law-abiding, and then afraid not to obey the law -- and thus because of the the yellow star the Nazis were able to easily identify Jews.