The proceedings from Celje conference (2014) are focused on the importance of mutual dependence within the triangle formed by ideology, the mission of museum collections and types of collections. Changes in ideological perspectives influence the formation and development of collections, and museums' missions are shaped and adapted in line with socio-political developments and the related changes. The themes of changing collecting strategies and practices, and the formation of collections as the medium of specific ideologies are also of interest to Slovene museology. This is why the Celje conference represented also an opportunity for international reflection on the transformation of Slovene museums and the transforming power of museum collections and objects.