What is an example of symbolism in the novel, The Witches?

The witches' masks are a symbol of deception, and part of the author's warning about not trusting just a person's appearance. A mask resembling a girl in her mid-twenties is worn by the Grand High Witch. The mask is designed to hide the Witch’s true, horrific facial features. The mask is removed by the Grand High Witch during the private meeting of the witches at the hotel. This is seen by the narrator, confirming to him that he is indeed surrounded by witches, and that he is indeed looking at the Grand High Witch herself.