The central theme of Oase 73 is the phenomenon of gentrification, a term attributed to Ruth Glass, who described the process of physical and social transformation of working-class areas in London in the early 1960's. During this process, the middle classes (gentry) took over working-class areas, upgrading the neighbourhoods physically, socially and economically, eventually making them too expensive for their original residents. Various authors contribute to the discussion that gentrification can be considered one of the leading issues of contemporary urban restructuring.