In the "Harry Potter" series the subjects of magical portraits (even those of characters that are dead) can move, interact with living observers, speak and demonstrate apparent emotion and personality. Some can even move to other portraits to visit each other, or relay messages, or (if more than one painting of the subject exists) move between separate locations by way of their portraits. An example of this is Phineas Nigellus Black (Sirius Black's great-great-grandfather), who has a painting in the Headmaster's office to offer advice to the current headmaster and another one at 12 Grimmauld Place. Many such portraits are found on the walls of Hogwarts.