How is it harder than trying to write a novel without the constraint of fitting in what's on the cover? Constraints often make creativity easier. Tell me to wr

How is it harder than trying to write a novel without the constraint of fitting in what's on the cover? Constraints often make creativity easier. Tell me to write a Hardy Boys novel and I won't know where to begin. Show me a cover with a lighthouse and some treasure on the beach and stories begin to suggest themselves.