When a new type of object appears in the archaeological record, what exactly has moved: the artefact, the idea behind it or the people who knew how to make it? Finished objects can travel over great distances without transferring any knowledge of their production. A brooch, vessel or tool may be exchanged, offered as a gift or carried by its owner into another community. Its presence proves contact, but it does not necessarily mean that local craftspeople understood the technology used to produce it.

The situation becomes more complicated when foreign objects begin to inspire local copies. Imitation may reproduce the appearance of an imported item while relying on familiar materials and manufacturing methods. Direct instruction transfers much more: practical knowledge, technological choices and working habits. Migration can carry objects, symbols, skills and practices together, while prolonged contact may lead to hybridisation. The resulting products no longer belong neatly to one tradition. They combine forms, materials and techniques drawn from different communities.

Archaeologists can sometimes recognise the process of learning in the objects themselves. Novice craftspeople may produce irregular forms, repeat predictable mistakes, use raw materials inefficiently or depart from the established sequence of production. Such traces can reveal how skills were acquired, whether through informal participation in household activities or more organised instruction. Learning could take place within families, through apprenticeship, marriage and fosterage, but knowledge also moved through the relocation of workers and the forced movement of enslaved people. Technical skills were therefore embedded in social relationships rather than transmitted as abstract instructions.

This distinction is central to our project. Northern-style objects found in La Tène contexts may represent imports, local imitations or the work of people who moved between different cultural environments. When a familiar form is produced from an unfamiliar material or made according to a different technological sequence, it may preserve evidence of adaptation rather than simple exchange. By comparing shapes, raw materials and manufacturing traces, we can ask whether communities acquired new objects, learned new ways of making them or incorporated craftspeople who brought their own knowledge. Technologies travelled in many ways, but the most complex skills usually required direct contact between people.