Die inzwischen kultige Sea-Monkey-Werbung aus den 80ern
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.
Sea-Monkeys - Magic Castle by Schylling - $19.99 magic rocks are still neat.