The phrase "utopian fantasy" refers to an idealistic idea or dream that is impractical or impossible to achieve in reality. It describes a vision of a perfect world that may seem wonderful but is not feasible or realistic. Full definition
She introduces representations of Utopian fantasies into her objects that call upon notions of familiarity and public desire filled with physical and ideological tension. (cooper.edu)
Inspired by art from the Renaissance period through the 19th century as well as utopian fantasies of the future, «The Strange City» represents the synthesis of a long artistic career. (artbook.com)
«Caution will not win the day; but nor will Jeremy Corbyn's leftist utopian fantasy, devoid of connection to the reality of people's lives.» (thesun.co.uk)