The observation perspective of materialities was chosen because further contributions to the analysis of the materialisation of migratory social boundaries can currently be expected from different, sometimes competing theoretical directions (keyword: discussions on 'new materialism'): For example, it is about the material and technological infrastructures and things that are used to create border formations. The question here is, for example, about the modes of production and institutionalised forms of mediation of borders and about which new networks or assemblages (cf. for example Marcus/Saka 2006; Hess/Schwertl 2013) of human and non-human actors in the sense of actor-network theory (e.g. Latour 2002; 2007) or science and technology studies (e.g. through border surveillance technologies) are created in the process. Furthermore, the aim is to analyse the agency of things and to pursue the question of the different ways in which things 'set boundaries' and the different boundaries that things set, i.e. the material effects of drawing boundaries. For example, an old-style barrier creates a different border (namely: linear) than the drone and satellite-supported information and attack system or the biometric fingerprint procedure, which attaches the border to the body. Finally, doctoral projects focussing on this observation perspective can deal with socio-economic, socio-spatial and political-economic aspects of border demarcations in and between migration society contexts. The question could be, for example, how the demarcations recognisable from the knowledge or subjectivation perspective are translated and materialised. From a global macro perspective, migration processes are also renegotiating the borders between the periphery and the centre.