The power of representations of future cities and their ability to endure in our imagination offers the possibility of multiple utopias. The extent of this transfer is evident along a spectrum of potentialities: from radical transformation of the present day to subtler and more nuanced versions of prevalent city conditions. Although many projects were never built and remained imaginary, this does not mean they are unworthy of attention. Their significance extends in other ways through their questioning of reality, reshaping our spatial conceptions or providing rich expressions of alternatives. Indeed, these future cities contribute to our social imaginary and resonate the values of the cultures in which they are produced. Reexamining lost futures enables us to frame critical utopianism and discuss the alternatives we may recuperate and rethink. This talk will therefore explore the philosophical values embedded in such representations as a mode of extrapolating forms of future cities as they accumulate within our collective imagination to embody the cities we want, need, desire, fear or dream of.