In Hindu religion, All Hindus worship Shivaling. What is the mystery is behind the shivaling. Both Hindus and Non Hindus don't know clearly about Shivaling. Worshiping Shipling is first started by tantrik followers. Then it is accepted by Vedic followers. According to Sanskrit language ling means Penis. Shiva linga mean the Penis of Almighty or God or Supreme power of universe. Shiva ling look like a linear circular stone like a male Penis and circular shape around that stone is look like women's vagina. According to Tantric or Vedic culture, we are living in sexual universe. We all creature increase our population by sexual activity by two opposite sex. Similarly, tantrik and Vedik people's thought that universe is made up of Brahma and Maya. Brahma is God or almighty, nirgun Nirankar (No quality and no shape). Maya is false thing, if create illusions, name Maya it self denote illusion. Black stone is a symbolic representation of God. Supreme power God is considered as male. And Maya is considered as female. Circular loop like formation around the linear circular stone is the symbolic representation of women. It's look like vagina. In Hinduism, it is considered that only God has not created this universe. It is created by both God (Shiva or Brahma) and Godess (Shakti or Maya). As both are not separated but both are complimentary. As Sun can't be separated without rays, heat can't be separated from fire, coldness can't be separated from Ice. Similarly Shakti can't be separated from Shiva. In tantrik text, it is also described that God (Shiva) is nothing without Godess (Shakti). It is considered soul as brahma and human body is as Maya. Without body, soul can't complete his activity. It was always mysterious for all that why Shiva linga is worshiped. All we know without mixing of two things. We can't make another thing. Without sex between male and female, a new child can't take birth. Hari OM