There comes the moment in every islander's life when its time to build the Wigwam:
As islands' evenings are pitch-dark, it is a difficult task to make a fire inside the Wigwam - the fire simply burns out. Luckily, there is an alternative source of light in the island - Fireflies. You can find them in the Blue Flowers' bushes that grow near the river:
Catching Fireflies is a difficult a task and it largely depends on luck (the possibility to catch them is not 100%) so don't blame your workers if they come back empty-handed. Keep on trying and you'll catch them eventually:
Once you collected the required amount of the Fireflies' jars you will be able to transform your Wigwams into the native art masterpiece and use it as a decoration.