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Austromancy is one of many names meaning divination by the wind.
Using the wind for insight is just a way of increasing your psychic skills. Sit in the breeze, be aware of the tug of the wind at your clothes and hair or listen to it whistling in through cracks. Go into a dreamy state and see what comes into your mind. If you have a question, shout it into the wind. Can you hear a reply? Does it blow you a feather, or a leaf? Use your intuition to interpret this.