Other research has focused on providing the user with a visual representation of the information space to aid retrieval. For example, the concept of 'piles of loosely structured information objects' has been investigated. This involves the use of a gesture-based interface to accomplish actions such as a zigzag to achieve the spreading out of a pile of objects. A similar concept is the 'information visualiser' which presents a three-dimensional view of the workspace available by using animated computer graphics.