These places, these points on the grid, De Certeau suggests, are like a language’s grammar or the letters of the alphabet. What he calls space is what happens when dwellers navigate those places: that is, when we put the individual letters together, when we formulate sentences, when we articulate words. Hence, one of De Certeau’s most cited lines: ‘Space is a practiced place.’ Space, here, is always spatialization: the putting to action or – to use that post-structuralist term – the performance of a pre-existing script. In De Certeau’s hierarchical definition, place is thus the stable, static, ideologically informed given, whereas space is about potentially anarchic movement – when you take routes that aren’t time-efficient or cost-effective, for instance, or if you skateboard or do parkour, creating your own, alternative path where there wasn’t one, expressing your own spatial ‘slang’, if you will.
— Timotheus Vermeulen on Michel de Certeau and Henri Lefebvre, "Space is the Place", Frieze Magazine