Question

Who suggested Coraline to explore the flat?​

Answer 1

Explanation:

The shadow shape goes under that door with the brick wall behind it. Hmmm. Coraline turns on the light and doesn't see anything, but the door is now open a tiny crack.

Answer 2

When asked about the origins of Coraline, Neil Gaiman has cited that his daughter, Holly, would ask him to write out stories she made up as a child. These stories would often be about her mother being replaced by a witch and how she escaped said peril.