We demonstrate Stackables, tangible widgets designed for individual and collaborative faceted browsing. In contrast, current interfaces for browsing and search in large data spaces largely focus on supporting either individual or collaborative activities. Each stackable facet token represents search parameters that can be shared amongst collaborators, modified, and stored. We show how individuals or multiple people can interact with Stackables and combine them to formulate queries on realistic datasets. We have successfully used and evaluated Stackables in a user study with a dataset of over 1500 books and 12 facets with ranges of thousands of facet values.