The collection has about 100.000 pieces of art in total. Just like a real visit to the museum it is possible to discuss a piece of art, or ask a question with all registered users of the site. Active discussions or questions are shown on the user account page. It is also possible to choose your favorite detail of an artwork and discuss it with other users. There is a lot of cross-referencing going on between all these content types and nodes to create certain elements. Especially the interactive elements make heavy use of this.