While physical destruction of a city's buildings is the most obvious form of urbicide, it can also occur in less noticeable ways. Governments redefining areas of the city as slums or "illegitimate" can lead to an unequal treatment of citizens. For people living in these areas they have been denied their citizenship. How a government zones a city can also generate violence. While not directly causing harm, certain zoning combinations could increase violence, decrease the value of properties, and force poorer people into an undesirable neighborhood.