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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 .
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