We are building a system that improves browsing and searching access to a large, growing collection by supporting users to build a faceted (multi-perspective) classification schema collaboratively. The system is targeted in particular to collections of photographs and images that, in general, have few textual metadata. Our system allows users to build and maintain a faceted classification schema collaboratively and have the system help to classify documents into the evolving facet schema automatically. This paper focuses on the evolution of faceted classification schema for a large growing collection.