The relevance of five elements in worship and pujas and other rituals is in their association with respective chakras. The chakras are subtle centers corresponding to spinal nerve centers in the body. The earth element is associated with muladhara chakra (in the lowest point of the spine at the end of the tailbone), of which Ganesha is the presiding deity. The water element is associated with the svadhisthana chakra (at the level of the sex organs), of which Brahma (the creator) is the presiding deity. The fire element is associated with manipura chakra (at the level of the navel), of which Vishnu (the preserver) is the presiding deity. The air element is associated with the anahata chakra (at the level of the heart) with presiding deity Shiva. The akasha (space element) is associated with Vishuddhi Chakra (at the throat level), with the jivashiva (Shiva in the individual) as the presiding deity. The sixth chakra, ajna (at the center of the brain, behind the eyebrow-center)...