This article aims at discussing the contributions of a doctoral workshop entitled ‘Vue(s) et point(s) de vue de Strasbourg’ who is interested in borders of urban space. This workshop is based on a common field of research – the city of Strasbourg – which brings together our doctoral work in spite of differences in terms of research subjects. Through three thematic issues – first on the representations of the urban space, second on the spatial and social fragmentations within the city and third on the links between ecology and the urban environment – one could look the boundaries of Strasbourg with diverse approaches – or ‘glasses’ – that complement one another. Each of these approaches nevertheless revealed some similarities: especially the importance to take into account the links between the urban space and its inhabitants, the co-construction of the city – from ‘above’ (top-down) and from ‘below’ (bottom-up) – as well as the effects of social and economic inequalities on the relationship between individuals and the city they live in.