This is a very old traditional belief in the "Foolish Fire" creatures. These are known as ignis fatuus, which is Latin for "giddy flame" or basically they're mostly called Will-o'-the-wisps. Today the most famous household flame creatures are the Jack - o'-lanterns. Others are called different names like hobby lanterns, hinkypunks, friar's lanterns and even fairies!
While many people associate them with pumpkin carvings every Halloween, there's a true phenomena about these mysterious lights. In other parts of the world, these orbs of fiery dancing lights are called Spook Lights, Marta Lights and St Louis Light in the Americas while in Norway are the Hessdalen Lights and in Thailand they're called Naga Fireballs. There's many folk stories about them. While science has a logical explanation about the lights, fairy tales and legends give them life and magic.
In Britain and Ireland, these firelights were believed to have been spirits of the dead. So as the veil is thin during this time of year, people made their own fire creatures by hollowing out vegetables and placing tea candles inside. Before the introduction of pumpkins, Europeans used other vegetables instead mainly turnips. This is practiced still today even when many prefer using pumpkins, because there's something very olde world about seeing turnip hob o' lanterns. Pumpkins are now widely available and they can grow in vast numbers in a small garden!
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