The 7th moon of the Chinese calendar is a spiritual month. It falls on 1st Aug this year. This month, due to astrological bodies alignment, spirit of other dimension may venture into this world & vise versa. So it is also a good time for human to send those wondering spirit to the other dimensions by asking the help of the Ghost king or to some believer, the Bodhisattva in her fearsome form , to bring all these wondering soul to other world or to rebirth cycle.
Thus prayer altar /platforms are put up with food , incense and what not to gather the wondering spirit or good brothers for those who want avoid the term ghost
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