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Shiva Lingam are a sacred stone of the Indian Hindu religion. They carry a strong grounding charge as well as balancing our inner male and female powers. This stone holds within it the feeling of unity and duality.
On one hand you see the masculine part of the stone within its phallic shape, and the feminine as well in the egg shape. The stone as a whole recognizes that they are one... yet they are each a separate entity within the one.