This is text written by Kevin O'Sheehan from a beautiful Asian Photo website.
The Shiva LungIn the Ghost festival, in Loei, the presence of the Shiva lung, or the representation of the male penis is omnipresent. Many of the dancers carry it as the 'krador'. Traditionally it represents the penis of the Lord Shiva, the source of all fertility for Hindus. This Hindu custom survives in all of these pre-monsoon fertility festivals of North-Eastern Thailand. Many of the 'kradors' are hinged with a trigger device, like this one, so they can be made to twitch in a most suggestive way during the dancing. In this culture such things are not objects of fear or prudery as they might be elsewhere.