LUNA 7.5 introduces Collection Sharing and Collection Categories.
Collection Sharing enables public collections from outside sources to be viewed in any LUNA instance. This feature is ideal for institutions looking to grow their digital visual resource offerings quickly and easily. More information on Sharing Collections in LUNA.
Collection Categorization helps organize the list of collections on the Viewer’s landing page into categories and sub categories, whether they are your own or coming from a different source. [link to category doc]