Nandi

Nandi (नंदी) is the name for the bull who serves as the mount (Vahana) of God Shiva and as the gate-keeper of Shiva and Parvati. He is the chief guru of eight masters including Patanjali and Thirumular. Temples venerating Shiva display stone images of a seated Nandi, generally facing the main shrine. Nandi is a very important deity, since he's the only witness to the creation of the Universe and all beings therein through Shiva-Shakthi. So praying to him will bestow us with spiritual knowledge, and enhance our receptiveness of the Lord's grace. Nandi is also the embodiment of intuition and instinct. That is why it is said that we should look at Lord Shiva from in between Nandi's horns.
That way, we can perceive and receive the Lord's grace by maximizing our instinctive & intuitive
abilities.