This article explains how the Replica project is a particular case of different professionals coming together to achieve the digitization of a historical photographic archive, intersecting complementary knowledge specific to normally unconnected communities. In particular the community of Art History researchers, brought together here in relation to their common methodologies in the practice of visual pattern research, became protagonists in the construction of a specific tool, the Morphograph, to navigate through the archive’s photos. A specific research problem, the recognition of visual patterns migrating from one work to another, became the key to developing a new technology initially intended for a specific community of users, but with such a generic character in its approach that it could easily be made available to other uninformed users as learning by doing tools. The Morphograph tool also made it possible to demonstrate how, within a community, the partial expertise of individuality needs to be related to each other and benefits enormously from the knowledge densification mechanism made possible by the sharing. The digital context easily makes it possible to create tools that are specific in terms of content but generic in form that can be communicated and shared with even diverse and uninformed communities.