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I do not know the origin of the ritual, but it is used widely in Waldorf Schools as an Advent celebration. The schools are based on a philosophy/religion called Anthroposophy, but I do not think of this ritual as strictly belonging to that faith. However, it is to them I give the credit of keeping alive the tradition. It may have older roots, or it may be something that their founder Rudolf Steiner and/or his followers created. He is also the father of biodynamic farming, which you have probably heard of, yes? I think because of the deep symbolism and wisdom contained within the ceremony, it has a universal appeal to people of many faiths. I have co-created this ritual several times now among people of many different faiths with all positive feedback.

I've heard of Steiner and biodynamic farming, but never the Waldorf School or anthroposophy. I'll look into them.