Node
From TARDIS Index File, the free Doctor Who reference.
They had limited functionality, being only capable of answering simple questions of visitors. They were like abstract statues, with a large headpiece which contained a "flesh aspect", a human face. Such faces were donated, a practice apparently quite common in the 51st century. One of the people that had donated a face was Mark Chambers.
Faces were chosen for each user individually from flesh banks by the computer, based on what it thought the user would like.
It was through such a node (with the name 710/aqua) that the Doctor and Donna got their first clues to what had happened in the Library, as it replayed a message by the head librarian, warning visitors to count the shadows.
Donna briefly became a node when the Doctor failed to send her back to the TARDIS. (DW: Silence in the Library / Forest of the Dead)
