<human>:  Why does the Phantom have a mask in the musical ‘The Phantom of the Opera’?
<bot>: The Phantom has a mask because he is a phantom. He is a mysterious figure who has never revealed his true identity. It is possible that the Phantom is a woman, but it is also possible that he is a man. The Phantom may also be a man who wears a mask, or a woman who wears a mask. The Phantom is also a symbol of the struggle between good and evil.