By concentrating on a pattern of moving lights, the caster falls in a semi-trance. (This is commonly a fire or light dancing on water or through leaves, but some Glass Walkers favor the moving screensavers for this rite.) If the caster concentrates on a given situation, they will find it easier to solve their problem. However, they lose track of the real world around them while doing this rite.
This rite is activated by preparing a question (and a subsequent roll) and staring into any pattern of moving light for a meaningful amount of time (an hour is usually a good marker). At the end of that period of time, the rite performer receives a small epiphany and an answer to that question or an extra dice on the subsequent roll to find an answer to the question (GM discretion).
Source: Homebrew/GarouMUSH Wikia (http://garoumush.wikia.com/wiki/Dance_Of_Lights)