Dynamic taxonomies and faceted search are increasingly used to organize and browse document collections. The main function of??dynamic taxonomies is to start with the full collection, and zoom-in??to a small enough subset of items for direct inspection. In this??paper, we present other navigation modes than zoom-in for less directed and more exploratory browsing of a document collection. The??presented navigation modes are zoom-out, shift, pivot, and querying??by examples. These modes correspond to query transformations, and??make use of boolean operators. Therefore, the current focus is??always clearly specified by a query.