• Problem: how to organize the interface in such a way that we can make perceivable all the information in a node  taking into account both aesthetic and cognitive aspects?
• Motivation
• Forces:
    – Information for one node does not fit in one screen
    – Scrolling may be often not acceptable
    – Partitioning the node is not acceptable
• Solution
    – Present only a sub-set of the attributes, the most important ones
    – Let the user control which further information is presented in the screen, by providing him active interface objects
    – The activation does not produce navigation: they just cause different attributes of the same node to be shown
• Known uses: Microsoft’s Art Gallery