And of course if you wrote a program to move the read-write arm in certain ways you could make it walk around the room. Or block the door, requiring that a hole

And of course if you wrote a program to move the read-write arm in certain ways you could make it walk around the room. Or block the door, requiring that a hole be cut in the wall to get back in there. An old professor of mine described these as like a `washing machine in heat'.