When Dodgson was in London, he met a little girl, Alice Liddell. He invited her indoors, put an orange in her right hand and asked her in which hand she was holding it. Then, he put her in front of a mirror, and asked which hand the child in the mirror was holding the orange in. Alice told him that it was in her left hand. When he asked her for an explanation, she answered: "Supposing I was on the other side of the glass, wouldn't the orange still be in my right hand?" He was delighted with her answer and decided that his new book would be about the world on the other side of the looking glass.