Moko is an explorer. As he travels the world continent by continent, he makes many friends and discovers many natural phenomena which sometimes delight him, and other times scare him. Each animated episode recounts an adventure and takes an "original story" approach to explaining these natural phenomena. In this episode, Moko and Mei-Lei suddenly hear a continuous sound coming from beyond the beach. As they approach the hills, the sound gets louder and Mei-Lei is more frightened, so Moko decides to go around the dune on his own. As he does so, the sound changes and becomes more of a song. Moko returns and tells Mei-Lei that it is the sand and the ground singing together. Moko thinks that the magical dune is urging him to go on with his travels and he knows that this is likely his last day in the village.