Definitions for "Crystal Ball"
A sphere of crystal or glass used for scrying.
A ball is made of quartz (you can tell if it is true quartz by its cold feel and the inclusion of irregularities). It is used for divination.
A glass ball used by fortunetellers gaze into in order to obtain a picture of future events.
a vital piece of hurricane prognostication equipment)
a positive thing -- if the medical community and society can use it with appropriate caution
Keywords:  matter, preference, personal
a matter of personal preference