Which famous children's book character was originally created as a marketing mascot for a publishing house before becoming a literary icon in its own right?

The publishing industry has created some memorable brand mascots that have helped market books and literary products for decades. These characters often transcend their marketing origins to become cultural icons in their own right. This trivia question explores one of the most enduring literary brand mascots and its fascinating history. Test your knowledge of the intersection between literature, publishing, and brand marketing!

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Clifford the Big Red Dog
The Very Hungry Caterpillar
The Cat in the Hat
Curious George