There are 35,000 children in the UK who are either deaf or have some form of hearing impairment. For them, even the simple act of looking at a book can be a challenge. Sharing a book with a child usually involves reading aloud, discussing the story, making animal sounds and using different voices, asking and answering questions. If the child cannot perceive sound, then the whole experience has to be tackled from a different perspective. A deaf child...