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• Migrations in the LC 2–3 created a novel cultural entity in the Southern Caucases. • Arrival of Mesopotamian populations led to mixing and genesis of cultural practices. • Material culture shows "Middle Ground" arenas where habitus was negotiated. • "Middle Ground" suggests cultural genesis during close and sustained interaction. The Late Chalcolithic Leilatepe "phenomenon" in the Southern Caucasus has often been regarded as the product of Mesopotamian incursions into the region for the purpose of acquiring metals and semi-precious stones for trade. The material evidence has shown clearly that these migrations resulted in the development of both hybridised and altogether new ways of engaging with the world, including novel architectural, metallurgical, ceramic, lithic, and ritual technologies and practices. This paper approaches this period of intense cultural interaction from a practice theory lens, aiming to view the social dynamics and processes associated with the emergence of Leilatepe "culture". In doing so, we draw from Richard White's Middle Ground concept to illustrate how new social practices emerge when two cultural groups with distinct habitus come into close and sustained contact with each other. Our research indicates that, while trade was likely an important aspect of the Leilatepe phenomenon, a number of factors also point to a sustained migration or migrations by a broad swath of Mesopotamian society who arrived in the region due to a combination of push and pull factors, and did not just engage in extractive trade, but settled permanently, creating new social realities. [ABSTRACT FROM AUTHOR]