I wrote Coraline because, when I was a child, I used to wonder what would happen if I went home and my parents had moved away without telling me.
(It could happen. Things sometimes slipped their minds. They were busy people. One night they forgot to pick me up from school, and it was only a wistful phone call from the school, at ten o’clock at night, asking if they were expected to keep me, that finally got me picked up. One morning my parents dropped me off at school without noticing that the half-term break had begun, and I wandered, confused, around a locked and empty school until I was eventually rescued by a gardener. So it was unlikely, but it was possible.)