Urban Assemblages rejects the city as a bounded, cohesive entity and replaces it with multiple enactments composed of heterogeneous relations. Its iconic idea is the urban assemblage: a provisional configuration of humans, artefacts, technical systems, spaces, histories, imaginaries and non-human actors. The theoretical contribution lies in importing Actor-Network Theory into urban studies while resisting its reduction to a fashionable template. Methodologically, the volume follows extended chains of causation across events, infrastructures, architectures and practices, allowing scale to emerge from relations rather than being assumed in advance. The conceptual operation is ontological multiplication: the city becomes many partially overlapping realities produced through different practices of association. The wider bridge reaches STS, urban anthropology, geography and planning theory. This approach strengthens description and reveals contingency, though it also raises political questions about asymmetry, conflict and responsibility. Assemblage is most useful when heterogeneity does not dissolve power but clarifies how power is materially assembled.