Interactive aquarium full of bioluminescent plankton called dinoflaggelates ("dinos"). The plankton illuminates the dinosaur-shaped environment when you gently shake it. Just let them bask in indirect light during the day, and they'll treat you to a soft blue light show at night.
This is something I would love to have many variations of for different stories. The kids are able to see the characters move as opposed to a picture in a book. They're able to also hear and connect to the characters that have a different voice. They can also create their own finger puppets and gain language development telling their story.