Which brings me to a perennial point that cannot be made frequently enough: If you don't remember what it's like to be a child, you don't get to write for them.

You, dumbasses: Have you only just realized that you have an imagination? And now you feel all artsy and free and want to inflict it on defenseless children?
(a) You're really rediscovering your imagination, and
(b) That magical ringing in your ears is the rust falling off.

Awesome advice, but...I didn't know enough people tried to publish children's books informing children that they could use their imagination for it to become an irritant.

It's like that time I was looking at submission guidelines for some fantasy short fiction magazine and one of the rules was "stop submitting police procedurals or private eye stories in a high fantasy setting".