Menurun or going in trance is part and parcel of the practice of Datuk Kong (Keramat) worship by Chinese Malaysians. It is the one of the ways in which devotees can communicate with the deity or keramat, and this process of menurun or 'inviting' the keramat to possess the body of the spirit
medium entails the generous burning of kemenyan (Styrax benzoin) that at times can leave the entire scene whitewashed in kemenyan smoke!
As the deity or keramat can be a local saint, or tree spirit or even past rulers of the land, the appearance of the mediums in trance with these deities are different, reflecting the origin of the deity summoned. Once the deity has 'arrived' in the body of the spirit medium, they would be dressed accordingly, and served with the deity's favourite beverage or smokes before any consultation session starts.
With each of the keramat being a different individual, the spirit medium upon being possessed by them will also take on a particular mannerism and characteristics associated with the deity; those are supposed to be possessed by an old saint will suddenly have shaky hands and need to walk with a cane, others being possessed by local spirits of wild animals will violently growl and grunt and act like the animal spirit, whilst those that are previous rulers will take on a regal and distinguished appearance and countenance.