Now the two friends reach the market square.

"Fish! Fresh fish! Freshly caught fish!" shout the fishermen from behind their stalls, with people crowding around to do their shopping.

"Look, Marco!" says the little mermaid. "Look at those children skipping and playing marbles and throwing a ball. Look! A peacock fish! And that funny gentleman trying to catch butterflyfish with his net..." In front of them, children and little fish race up and down the spiral staircase of a very special palace, one that looks like a large corkscrew...