Book excerpt: It is not possible to ignore the fact that cities are not only moving, vibrant and flourishing spaces, promising hope for better quality of life, but that they also accumulate and reflect significant problems. This book explores the relational and dynamic nature of urban inequalities, including their visible and invisible forms. By using the rather elusive term of ‘uncertainty’, the authors zoom in on specific aspects of urban inequalities that are difficult to measure, yet are acutely sensed and experienced by people and, more and more often, perceived as unfair. Here, in the recognition of inequalities as unjust and in the disagreement with the status quo, lies a positive aspect of uncertainty, which can lead to a social awakening and more active citizenship.