Tibetan Dzogchen masters teach that ones true, "Buddha" nature is like a mirror.
It symbolizes emptiness and the perfect clarity of the essential Self, which is pure and unaffected by the reflections of the world.
The three circles represent purity of heart, openness of mind, and integrity of action.
It is representative of the element water, and is used for divination or to look into the divine side of the Self.
You are the secret of God's secret.
You are the mirror of divine beauty.