This method is based on observation. There are 2 schools; form or known as observation and compass or known as calculation. One could not do without the other. It is best use in combination.
Open door to Jade Belt Water 门前有玉带水：Auspicious house吉宅
If your main door opens to a flowing river in the shape of an inverted U shape like a official belt, it is said that your one of your family members will have the capability to become a government officials or achieve good academic success and prosperity.
Consider: Sediments will deposits in this part. Land on this side will grow.
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