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Gray space is a theoretical concept that explains the causes and consequences of a rapid expansion in informal and temporary urban development, widely prevalent in contemporary city regions. It argues that the rise of informality reflects a significant transformation of urban regime and citizenship. The concept was formulated by Geographer and urbanist Oren Yiftachel who noted that through a process of 'gray spacing', urban society is increasingly being governed under frameworks of 'separate and unequal', spawning greater uneven fragmentation, conflict and ethno-class stratification. Urban and planning theorists are thus challenged by this theory to reinvent equal and just forms of belonging and resources allocation in the increasingly informal city.