Hippiemancy is one of the eight major classes of magic in Erfworld. It is the major class defined by the Life and Matter elements together. According to Duncan Stone, Hippiemancy (among other things) concerned with relationships: "detecting and altering the forces of opposition and attraction which bind people or units."book-2-–-text-updates-011 Hippiemancy can apparently be used to "quiet" a conflict, though the precise meaning of "quiet" has not been revealed.
The performance of Hippiemancy can affect the participants' perception of time, a phenomenon known as "flaking."
A practitioner of Hippiemancy is called a Hippiemancer.
With their confluence of Life and Matter and their absence of Motion Classes, it may be that within Hippiemancy Flower Power (Erf) might influence the environment/nature (space), Signamancy (Fate) might influence perspective/insight (vision), and Date-a-mancy (Numbers) might influence synchronicity (time in meaningful events, or put another way, the inverse of meaningful events in time).