There’s a beautiful story by AS Byatt about an ice princess who is courted by a number of suitors. The one who captures her heart has made her a sparkling gift of an ice castle and so she agrees to marry him. But the ice castle is made of glass, and glass is made of melted sand, and sand comes from burning hot deserts. She becomes a prisoner in the only safe place you can keep such a person in this environment: deep within the mountain. Even the prince’s passion burns her. It’s a stunning story, and ever since I read it I have never looked at glass the same way.