The lower castes of the Borana people, states Herbert Lewis – a professor of Anthropology specializing on East African societies, show no physical differences from the noble castes of Somalia and Somalilands. Other than endogamy and occupational differences between the castes, their ritual, social and political positions are different, as are the beliefs held by each about the nature of the other. For example, the castes have long considered each other as ritually impure, and food prepared by either nobles or artisans castes is considered a taboo to others. Similarly, traditionally, the craftsman and the noble are ritually forbidden to enter the house of the other. Low caste people are expected not to handle farm equipment or cattle.