Will-o'-the-wisp also known as will~o~wisp or simply as wisp and willow .was thought to be a spirit or soul dwelling mostly on cemetery ground or swamps .
Now thought to be gasses emitted by decomposing biological matter and inflaming on contact with air thus generating small dancing flames or lights .
This phenomenon spawned a cartoon series called Willow the wisp , where a friendly spirit told children about fantastic tales that happened in a mysterious dark forest .
Will-o'-the-wisp is a spirit dwelling in dark places .
will-o'-the-wisp is the result of dead organism decomposing in swamps and cemeteries .